Catholic vs Orthodox: What Divides Them and What Unites Them

Papacy, filioque, purgatory, divorce, Communion rules, 1965 and Nicaea 2025, with a clear verdict

Catholics and Orthodox share the same seven sacraments, the same apostolic priesthood and the same Nicene faith, and the Catholic Church teaches that the Orthodox Eucharist is the true Body and Blood of Christ (CCC 838; Unitatis Redintegratio 15). The two Churches have been out of full communion since the eleventh century, and what still divides them is mainly the authority of the Pope, with the filioque, purgatory, the Immaculate Conception and remarriage after divorce close behind. This guide sets out each disputed point in each side's own terms, gives the Catholic answer, and tells you plainly where we stand.

Deesis mosaic Hagia Sophia
Image: Deesis mosaic Hagia Sophia, Photograph: Myrabella, Public domain, via Wikimedia Commons

Our Verdict

The Orthodox are our brothers, and their Church is a true Church with true sacraments. Their liturgy, their fasting, their monks and their icons put most Western parishes to shame. Any Catholic who sneers at Orthodoxy has not prayed a Vigil on Athos or stood through a Paschal midnight service.

The Catholic Church still holds that the Orthodox lack one thing Christ built into his Church: Peter, with real authority to hold the whole flock together (Matthew 16:18 to 19; Luke 22:32; John 21:15 to 17). Orthodoxy's own last century proves the point. Moscow broke communion with Constantinople in 2018, four Churches stayed away from the 2016 Council of Crete, and nobody on earth has the authority to settle it. The other disputes, the filioque, purgatory, the Immaculate Conception, are real, and most of them shrink when each side is read in its own terms. The papacy does not shrink, and it is where the honest conversation has to go.

Bottom line: Catholics and Orthodox share almost the whole faith and the same sacraments. Only the Catholic Church has the successor of Peter, and Christ prayed that we would be one (John 17:21), so the split is a wound to pray and work to heal starting today.

For a full description of Orthodox belief and worship on its own terms, read our guide to the Eastern Orthodox Church. This page is the head-to-head comparison.

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1. What Is the Difference Between Catholic and Orthodox?

The main difference between Catholic and Orthodox Christians is authority. Catholics believe the Bishop of Rome, as successor of St Peter, holds a primacy of real jurisdiction over the whole Church and can teach infallibly under strict conditions. Orthodox Christians grant Rome a historic primacy of honour, which they say Rome forfeited by schism, and they hold that the whole Church is governed by bishops meeting in council, organised into self-governing (autocephalous) national Churches.

Almost every other difference flows from that one. The filioque became a crisis because a Pope approved adding a word to the Creed, and the Orthodox say no Pope could do that. The Immaculate Conception divides partly because Pius IX defined it alone in 1854. Purgatory was defined at Western councils the Orthodox do not accept as ecumenical. Settle the authority question and the rest becomes a conversation among theologians. Leave it unsettled and every other agreement stays fragile.

The break is usually dated to 1054, when papal legates and the Patriarch of Constantinople excommunicated each other. Historians rightly add that it was a slow estrangement that hardened over centuries, with the sack of Constantinople by Western crusaders in 1204 doing more damage than 1054 ever did. Our guide to the Great Schism of 1054 tells that history in full.

2. Catholic vs Orthodox Beliefs at a Glance

Catholics and Orthodox agree on far more than they disagree on, and the table below lists the points where they differ. Read it as a map to the sections below, each of which states the Orthodox position fairly before giving the Catholic answer.

QuestionCatholicOrthodox
The papacyThe Pope, successor of Peter, has full, supreme and universal jurisdiction, and can teach infallibly under strict conditions (Vatican I; CCC 882, 891)Rome held a primacy of honour in the first millennium; no bishop has jurisdiction over the whole Church; councils are the highest authority
The filioqueThe Spirit proceeds from the Father and the Son as from one principle (CCC 246 to 248); the Latin Creed says "and the Son"The Spirit proceeds from the Father alone; the addition to the Creed was unlawful and theologically mistaken
PurgatoryA defined doctrine: a final purification after death for those who die in grace, helped by our prayers (CCC 1030 to 1032)Prays for the dead and believes prayer helps them; rejects the Latin term, the idea of temporal punishment and a defined place or fire
Immaculate ConceptionDogma since 1854: Mary was preserved from original sin from conception (CCC 491)Honours Mary as all-holy (Panagia); rejects the dogma, partly from a different understanding of original sin
Divorce and remarriageA valid, consummated sacramental marriage cannot be dissolved; a tribunal may declare a marriage null (CCC 2382)By "economy" (oikonomia) the Church may permit a second and third marriage, with a penitential rite
Married clergyLatin rite priests are normally celibate; Eastern Catholic Churches ordain married men; bishops are celibateMarried men may be ordained deacon and priest; bishops are chosen from celibate monastics
CalendarGregorian calendar for all feasts and EasterMany Churches keep the Julian calendar for fixed feasts; almost all date Easter (Pascha) by the Julian calendar
Eucharistic breadUnleavened bread in the Latin rite; leavened in most Eastern Catholic rites; both validLeavened bread only
Sign of the crossLatin custom: forehead, chest, left shoulder, then rightForehead, chest, right shoulder, then left, with thumb and two fingers joined
SacramentsSeven, and Orthodox sacraments are fully recognised (Unitatis Redintegratio 15)Seven "holy mysteries"; recognition of Catholic sacraments varies by jurisdiction

The Orthodox column describes common teaching and practice. Each autocephalous Church governs its own discipline, so ask the local parish before assuming.

3. What Unites Catholics and Orthodox?

Catholics and Orthodox share the same apostolic succession, the same seven sacraments, the same first seven ecumenical councils and the same Nicene Creed (apart from one word). The Second Vatican Council said it without hedging: the Eastern Churches, "although separated from us, yet possess true sacraments and above all, by apostolic succession, the priesthood and the Eucharist, whereby they are linked with us in closest intimacy" (Unitatis Redintegratio 15).

The Catechism goes further. It says that with the Orthodox Churches the communion is so profound "that it lacks little to attain the fullness that would permit a common celebration of the Lord's Eucharist" (CCC 838, quoting Paul VI). No Protestant body receives that kind of language from Rome, because no Protestant body has kept a valid priesthood and Eucharist in the Catholic understanding.

In practice this means a great deal. An Orthodox priest's absolution forgives sins. An Orthodox liturgy makes Christ truly present on the altar. A marriage between a Catholic and an Orthodox celebrated by an Orthodox priest is recognised by the Catholic Church as valid (canon 1127 governs the details, and the Catholic party still needs permission from the bishop). An Orthodox Christian who enters full communion with Rome is never rebaptised or reconfirmed.

Both Churches also venerate icons (Nicaea II, 787), honour Mary as Theotokos, the Mother of God (Ephesus, 431), invoke the saints, pray for the dead, keep fasts, revere monasticism and teach that the Christian life ends in sharing the divine nature (2 Peter 1:4; CCC 460). A Catholic who walks into an Orthodox church is among family. The family is estranged, and that is a scandal before the world, because Jesus prayed "that they may all be one... so that the world may believe" (John 17:21).

4. The Papacy: Honour or Jurisdiction?

The papacy is the deepest difference between Catholic and Orthodox, and both sides say so.

The Orthodox position, in its own terms

Orthodox Christians say the Church of Rome held first place among the ancient patriarchates and "presided in love," as St Ignatius of Antioch put it in his letter to the Romans. That primacy was a primacy of honour and of service within a communion of equal bishops. Every bishop who confesses Peter's faith sits in the chair of Peter. The Church's highest authority is the ecumenical council, received by the whole Church. Vatican I's definition of universal jurisdiction and papal infallibility in 1870 is, for the Orthodox, the clearest proof that Rome changed the ancient constitution of the Church.

The Catholic answer

The Catholic Church agrees that the first millennium did not look like the modern Vatican, and it has said so in dialogue. The 2007 Ravenna document of the Joint International Commission agreed that Rome held first place in the order of the ancient Churches, while noting the two sides still differ on what that primacy meant. John Paul II went further than any Pope before him and asked Orthodox leaders to help him find a way of exercising the primacy that both could accept (Ut Unum Sint 95).

What the Church cannot give up is the substance. Christ renamed Simon "Rock" and promised to build his Church on him and to give him the keys of the kingdom (Matthew 16:18 to 19). He prayed for Peter's faith so that Peter would strengthen his brothers (Luke 22:32). After the resurrection he charged Peter alone, three times, to feed his sheep (John 21:15 to 17). Keys in Scripture mean governing authority (Isaiah 22:22). When the bishops at Chalcedon in 451 heard Pope Leo's Tome read, they cried out that Peter had spoken through Leo. That was an Eastern council.

The Catechism teaches that the Pope "has full, supreme, and universal power over the whole Church, a power which he can always exercise unhindered" (CCC 882), and that infallibility applies only when he defines a doctrine of faith or morals as supreme teacher (CCC 891). Infallibility is narrow. It has been formally used very rarely.

The hard question for an Orthodox friend: when two Orthodox Churches break communion, as Moscow and Constantinople did in 2018, who decides which side is right? A council needs someone to call it and someone whose reception settles it. Christ gave the Church a living centre of unity, and the Catholic Church believes it is still there.

For the history and theology of the office itself, read our guide to the papacy.

Read Matthew 16 and John 21 with the Church, then decide

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5. The Filioque: How Does the Spirit Proceed?

The filioque is the Latin phrase "and the Son" in the Creed: "I believe in the Holy Spirit... who proceeds from the Father and the Son." The Creed of Constantinople in 381 said only "who proceeds from the Father." The words were added in Spain in the sixth century, spread through the Frankish Church, and entered the Creed sung at Rome in the eleventh century.

The Orthodox position, in its own terms

The Orthodox make two objections. The first is canonical: the Creed belongs to the whole Church, the Council of Ephesus forbade composing another creed, and no single patriarch could change it. The second is theological: the Father is the one source of the Godhead, and saying the Spirit proceeds from the Son as well seems to make two sources or to blur the Father and the Son. Jesus himself said the Spirit "proceeds from the Father" (John 15:26). St Photius of Constantinople pressed this case in the ninth century, and most Orthodox theologians still do.

The Catholic answer

The Catholic Church teaches that the Spirit proceeds eternally from the Father and the Son "as from one principle" (CCC 246, 248). The Father remains "the principle without principle," the first origin of the Spirit, and as Father of the only Son he is, with the Son, the single principle of the Spirit (CCC 248). Scripture calls the Spirit "the Spirit of his Son" (Galatians 4:6) and "the Spirit of Jesus Christ" (Philippians 1:19), and Jesus says he will send the Spirit from the Father (John 15:26) and that the Spirit will take what is his (John 16:14 to 15). Great Fathers on both sides, among them St Augustine in the West and St Cyril of Alexandria in the East, spoke of the Spirit coming from the Father through or from the Son.

Rome has also conceded a good deal. In 1995 the Pontifical Council for Promoting Christian Unity published a clarification acknowledging that the Greek word for "proceeds" in the Creed refers to the Father as sole source, and that the Latin word carries a wider sense. Eastern Catholics may say the Creed without the filioque, and Popes have recited it in Greek without the added words. The Catechism itself admits the two traditions are complementary when they are not hardened (CCC 248).

Many theologians on both sides now think the filioque, properly explained, is a difference of expression. The canonical grievance, that Rome altered the common Creed alone, is really another form of the papacy question. Our full guide to the filioque controversy goes through the Greek, the Fathers and the councils.

6. Purgatory and Prayer for the Dead

Catholics and Orthodox both pray for the dead and both believe those prayers help the departed. The disagreement is about how to describe what happens to them.

The Orthodox position, in its own terms

Orthodox Christians pray for the departed at every Divine Liturgy and at memorial services on the third, ninth and fortieth days. They believe the souls of the faithful await the final judgment in a state that the Church's prayer can help. They reject the word purgatory, the idea of a temporal punishment still owed after forgiveness, indulgences, and the Latin picture of a purifying fire, which St Mark of Ephesus argued against at the Council of Florence in 1438 to 1439. Many Orthodox prefer to leave the state of the dead a mystery.

The Catholic answer

The Catholic doctrine is narrower than people think. The Catechism teaches that those who die in God's grace and friendship, "but still imperfectly purified, are indeed assured of their eternal salvation; but after death they undergo purification, so as to achieve the holiness necessary to enter the joy of heaven" (CCC 1030). The Church commends prayer and the Eucharistic sacrifice for them (CCC 1032), following 2 Maccabees 12:46 and St Paul's picture of a man saved "but only as through fire" (1 Corinthians 3:15). Nothing in the definition requires a place, a clock or a literal flame.

Put that beside Orthodox practice and the gap is small. Both Churches believe the dead can be helped by the living, which means something about them still needs helping. Catholics call that purification. Our guide to purgatory answers the usual objections.

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7. The Immaculate Conception

The Immaculate Conception is the Catholic dogma that Mary, from the first moment of her conception, was preserved free from all stain of original sin, by a singular grace and in view of the merits of Christ. Pope Pius IX defined it in 1854 (Ineffabilis Deus; CCC 491).

The Orthodox position, in its own terms

No Christians love the Mother of God more fiercely than the Orthodox. They call her Panagia, the All-Holy, and sing that she is "more honourable than the Cherubim." They still reject the dogma for two reasons. First, most Orthodox understand the inheritance from Adam as mortality and a wounded nature, with no inherited guilt, so they see no guilt for Mary to be preserved from. Second, the dogma was defined by a Pope without an ecumenical council, which for them makes it an innovation whatever its content.

The Catholic answer

The Catholic Church agrees that original sin is no personal guilt. The Catechism calls it a sin "contracted" and not "committed," "a state and not an act" (CCC 404). What the dogma says is that Mary was never, for a moment, without the grace and friendship of God. The angel greets her as "full of grace" (Luke 1:28), and the Catechism cites the Eastern Fathers themselves, who called her "the All-Holy" and "free from any stain of sin" (CCC 493). Read that way, an Orthodox Christian who confesses Mary as always all-holy is very close to the substance. The remaining objection is the method of definition, which is the papacy question once more.

Both Churches also celebrate Mary's death and her being taken body and soul into glory. The East calls it the Dormition. The West defined the Assumption in 1950. Both keep the feast on 15 August, which falls on 28 August of the civil calendar for Churches that follow the Julian calendar.

8. Divorce and Remarriage

Divorce and remarriage is the most practical difference between Catholics and Orthodox, and the one most likely to touch your family.

The Orthodox position, in its own terms

The Orthodox Church teaches that marriage is a holy mystery and is meant to last forever. It also applies "economy" (oikonomia), a pastoral leniency that bends the strict rule for the salvation of a person in a broken situation. Pointing to Christ's exception "except for unchastity" (Matthew 19:9), Orthodox bishops may permit a divorced person a second marriage, and in some cases a third, celebrated with a more penitential rite. A fourth marriage is never permitted. The Orthodox see this as mercy for human weakness, and see Catholic annulments as a legal fiction that reaches the same place by a longer road.

The Catholic answer

The Catholic Church holds to the hardest words Jesus ever spoke about marriage: "Whoever divorces his wife and marries another commits adultery against her; and if she divorces her husband and marries another, she commits adultery" (Mark 10:11 to 12; see also Luke 16:18 and 1 Corinthians 7:10 to 11). A valid, consummated marriage between baptised persons cannot be dissolved by any human power (CCC 1640, 2382). Matthew's exception clause is read by the Church as referring to unions that were unlawful from the start.

An annulment, properly a declaration of nullity, is a finding that a valid marriage never came into being, because something essential was missing on the wedding day. It is no Catholic divorce. Where a valid marriage existed, the Church has no power to set it aside. Our guide to Catholic marriage explains the annulment process, and our guide to divorce covers what a separated Catholic may and may not do. If you are a divorced Catholic in pain, go and talk to a priest this week. The Church holds a hard line and an open door at the same time.

9. Married Priests, Calendar, Bread and the Sign of the Cross

The remaining differences are matters of discipline and custom. None of them is a doctrinal barrier, and Eastern Catholics prove it, because they follow the Orthodox practice on almost every one of these points while in full communion with Rome.

Married clergy

Orthodox Churches ordain married men as deacons and priests, provided they married before ordination. Bishops are chosen from the celibate monastic clergy. The Latin Catholic Church normally requires celibacy of priests as a discipline (canon 277), with exceptions such as married former Anglican and Lutheran clergy. Eastern Catholic Churches ordain married men exactly as the Orthodox do. Both Churches agree that a priest may not marry after ordination and that bishops are celibate. St Paul's praise of celibacy (1 Corinthians 7:32 to 35) and his rule that an overseer be "the husband of one wife" (1 Timothy 3:2) both stand.

The calendar

Catholics use the Gregorian calendar, introduced by Pope Gregory XIII in 1582. Some Orthodox Churches, including Russia, Serbia, Georgia, Jerusalem and Mount Athos, keep the older Julian calendar for fixed feasts, so their Christmas falls on 7 January by the civil calendar. Others, including Constantinople, Greece and Romania, use a Revised Julian calendar for fixed feasts and celebrate Christmas on 25 December. Nearly all Orthodox calculate Pascha from the Julian calendar, so Easter usually falls on a different Sunday in East and West. In 2025 both fell on 20 April.

Leavened and unleavened bread

The Orthodox use leavened bread for the Eucharist, a sign of the risen and living Christ. The Latin Church uses unleavened bread, following the Passover setting of the Last Supper. In the eleventh century this was a bitter quarrel, and Patriarch Michael Cerularius attacked the Latin practice in the run-up to 1054. The Council of Florence (1439) declared both valid, and Eastern Catholics use leavened bread to this day.

The sign of the cross

Orthodox Christians cross themselves from forehead to chest, then right shoulder to left, with the thumb and first two fingers joined for the Trinity and the last two fingers folded for the two natures of Christ. Latin Catholics today touch the left shoulder first, usually with an open hand. Eastern Catholics cross themselves the Orthodox way. Neither direction is doctrine. Both confess the Trinity and the Cross.

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The East keeps fasts, vigils and the Jesus Prayer. The West keeps the Rosary, the Hours and Eucharistic adoration. Most of us keep neither. Pro gives you prayer frameworks for morning and night, audio-guided prayer sessions, audio devotionals with calming music for your commute, worship playlists and a circle of believers to pray with. Will you stick with it? The audio does the leading, so you only have to press play. No one knows the day or the hour (Mark 13:32). Do not wait for the Churches to reunite before you start praying. Why only $49 once when the big prayer apps charge $59.95 to $100 a year? It is all digital, made once and shared with every member, with no office or agency to pay for. We are rooting for you.

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10. Can Catholics Receive Communion in an Orthodox Church?

Catholic law permits a Catholic to receive Communion from an Orthodox priest in limited circumstances, but Orthodox discipline almost always forbids it, and the Catholic should respect the Orthodox rule. The reverse is also true: Catholic law permits an Orthodox Christian to receive at Mass, while the Orthodox Church usually tells its own faithful not to.

What Catholic law says

Canon 844 of the Code of Canon Law sets the rules. Under canon 844 section 2, a Catholic may receive penance, the Eucharist and anointing of the sick from non-Catholic ministers in whose Churches these sacraments are valid, when necessity requires or genuine spiritual advantage suggests, when it is physically or morally impossible to approach a Catholic minister, and provided the danger of error or indifferentism is avoided. Orthodox Churches meet the validity test. Under canon 844 section 3, Catholic ministers may give these same sacraments to members of the Eastern Churches who ask for them of their own accord and are properly disposed. The Catechism describes this sharing, in suitable circumstances and with Church approval, as "not merely possible but... encouraged" (CCC 1399).

What Orthodox discipline says

Orthodox Churches teach that sharing the Chalice expresses full unity of faith that does not yet exist. As a rule, an Orthodox priest will not give Communion to a Catholic, and Orthodox bishops ask their faithful not to receive at Catholic Masses. There are local exceptions in some places for pastoral emergencies, and the practice varies, but you should assume the answer is no unless the priest tells you otherwise.

What to do in practice

  1. At an Orthodox Liturgy, do not approach the Chalice. Stay in your place and pray. At the end you may come forward for the blessed bread (antidoron), which many parishes offer to visitors. Ask quietly if unsure.
  2. If you are Orthodox at a Catholic Mass, Catholic law allows you to receive, and your own bishop will probably ask you not to. Follow your own Church's rule.
  3. Sunday Mass. Attending an Orthodox Liturgy does not ordinarily fulfil the Sunday obligation, which canon 1248 ties to a Mass in a Catholic rite. If no Catholic church is reachable, the obligation ceases, and an Orthodox Liturgy is a worthy way to keep the Lord's Day. Ask your pastor if you live in that situation. Our guide to missing Sunday Mass explains the obligation.
  4. Mixed marriages. A Catholic marrying an Orthodox Christian needs the bishop's permission, and a wedding before an Orthodox priest is valid. Talk to your parish priest at least six months before the wedding.

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11. 1965: Lifting the Excommunications

On 7 December 1965, the day before the Second Vatican Council closed, Pope Paul VI and Ecumenical Patriarch Athenagoras I issued a joint declaration removing the excommunications of 1054 "from the memory and from the midst of the Church." It was read at the same hour in St Peter's Basilica in Rome and at the Phanar, the Patriarchate's seat in Istanbul.

The gesture followed their meeting in Jerusalem in January 1964, the first between a Pope and an Ecumenical Patriarch in more than five centuries. The 1965 declaration expressed regret for the offensive words, the groundless reproaches and the reprehensible gestures on both sides in 1054, and committed both Churches to dialogue in a spirit of trust and charity.

It is important to know what 1965 did not achieve. The 1054 sentences were personal acts between Cardinal Humbert and Patriarch Michael Cerularius and their circles. Lifting them healed the memory and opened dialogue. It did not restore full communion, because the doctrinal questions remained. Since 1979 the Joint International Commission for Theological Dialogue has been working through them, and for decades the two Churches have exchanged delegations on the patronal feasts of Rome (29 June) and Constantinople (30 November, St Andrew).

12. Nicaea 2025: Leo XIV and Bartholomew at Iznik

On 28 November 2025 Pope Leo XIV and Ecumenical Patriarch Bartholomew prayed together at Iznik in Turkey, the ancient Nicaea, to mark 1,700 years since the First Ecumenical Council of 325. They met at the excavated ruins of the Basilica of St Neophytos on the shore of Lake Iznik, joined by leaders of other Christian Churches, and together recited the Nicene Creed in its original form, without the filioque.

The next day, 29 November, at the Phanar in Istanbul, the two signed a joint declaration. It called the Nicaea commemoration "an extraordinary moment of grace," affirmed that "what binds us together is the faith expressed in the creed of Nicaea," and marked the sixtieth anniversary of the 1965 declaration of Paul VI and Athenagoras. It noted that in 2025 the whole Christian world had celebrated Easter on the same day and committed both Churches to keep seeking a common date for Easter every year. It also restated support for the Joint International Commission, which is now examining the questions that have historically divided the Churches.

The meaning is plain. The Pope and the Patriarch stood together on the ground where the Church first defined that the Son is "true God from true God," and agreed that this faith is still their common faith. They signed nothing that ends the schism. They did show the world that the two largest apostolic Churches confess the same Christ, and that both want the split healed.

"I appeal to you, brothers, by the name of our Lord Jesus Christ, that all of you agree, and that there be no divisions among you, but that you be united in the same mind and the same judgment."

1 Corinthians 1:10

13. What Should You Do Now?

Do something about the split today. Christ prayed for unity on the night before he died, and a Christian who shrugs at a thousand-year wound has not listened to that prayer. Here is a plan for each kind of reader.

If you are Catholic

  1. Visit an Orthodox or Eastern Catholic Divine Liturgy this month. Stand, listen, cross yourself, and do not approach the Chalice at an Orthodox church. You will learn more about the East in ninety minutes than in a month of reading.
  2. Learn the Jesus Prayer. "Lord Jesus Christ, Son of God, have mercy on me, a sinner." Pray it slowly for ten minutes tonight. It is the shared treasure of East and West.
  3. Read the Petrine texts for yourself. Matthew 16:13 to 20, Luke 22:31 to 32 and John 21:15 to 19, slowly, with a notebook.
  4. Pray for unity every day. Add one line to your night prayer: "Lord, make us one, as you and the Father are one."

If you are Orthodox

  1. Read Unitatis Redintegratio 14 to 18 and CCC 838. See for yourself how the Catholic Church speaks of your Church.
  2. Ask the Peter question honestly. If Christ gave his Church a centre of unity, where is it now?
  3. Look at the Eastern Catholic Churches. They keep your liturgy, your calendar, your married priests and your spirituality in full communion with Rome. Our guide to the Eastern Catholic Churches explains how.

If you are drawn East

Plenty of Catholics and Protestants fall in love with Orthodox worship. If that is you, the beauty is real, and you do not need to leave the communion of Peter's successor to pray the way the East prays. A Byzantine Catholic parish gives you the same Divine Liturgy. Leaving the Catholic Church is a grave step. Talk to a priest before you take it.

Start your daily prayer for unity today. Pro gives you prayer frameworks, audio-guided prayer sessions and a circle of believers to pray with, plus in-depth Bible studies on the Church. Get Pro for $49, once, lifetime access, 30-day money-back guarantee. If it does not help, ask for your money back.

If religious conflict in your family has left you in a dark place: mixed-faith marriages and conversions can tear families apart, and the pain is real. Talk to someone today. In the US call or text 988. In the UK and Ireland call Samaritans on 116 123. In Australia call Lifeline on 13 11 14. Elsewhere, find a line at findahelpline.com. A priest, your doctor or a Catholic therapist can walk with you, and God's mercy is never closed to you.

Do not wait for a council to start living the faith you share

Catholics and Orthodox confess the same Creed, receive the same sacraments and will stand before the same Judge. No one knows the day or the hour (Mark 13:32). Get ready now. Pro gives you audio devotionals, audio-guided prayer sessions for anxiety, healing, protection and more, in-depth Bible studies, worship playlists, a circle of believers to pray with, counselling sessions with a qualified therapist, and offline access to all of it. Is $49 too much? It is less than one year of the big prayer apps, you pay once, and you keep it for life. No purchase makes you holy. Christ does that through his sacraments, and Pro helps you keep praying between them.

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Frequently Asked Questions

What is the main difference between Catholic and Orthodox?

The main difference is the authority of the Pope. Catholics believe the Bishop of Rome, as successor of St Peter, has full and universal jurisdiction over the Church and can teach infallibly under strict conditions (CCC 882, 891). The Orthodox grant Rome a historic primacy of honour only and hold that councils of bishops are the highest authority.

Does the Catholic Church recognise Orthodox sacraments?

Yes. The Second Vatican Council taught that the Orthodox Churches possess true sacraments, above all the priesthood and the Eucharist, by apostolic succession (Unitatis Redintegratio 15). The Catechism says the communion between them is so profound that it lacks little for a common celebration of the Eucharist (CCC 838).

Can a Catholic receive Communion in an Orthodox church?

Canon 844 of the Code of Canon Law allows a Catholic to receive from an Orthodox priest when necessity or genuine spiritual advantage requires it and a Catholic minister cannot be reached. Orthodox Churches, however, normally do not give Communion to Catholics, so a Catholic should respect that rule and not approach the Chalice unless the priest says otherwise.

Can an Orthodox Christian receive Communion at a Catholic Mass?

Catholic law allows it when an Orthodox Christian asks of their own accord and is properly disposed (canon 844 section 3). Most Orthodox bishops ask their faithful not to receive at Catholic Masses, so Orthodox Christians should follow the discipline of their own Church.

Do Orthodox believe in purgatory?

The Orthodox pray for the dead and believe those prayers help them, but they reject the term purgatory, the idea of temporal punishment after forgiveness, and indulgences. The Catholic doctrine itself is simple: those who die in grace but imperfectly purified undergo purification after death and are helped by our prayers (CCC 1030 to 1032).

When were the 1054 excommunications lifted?

On 7 December 1965 Pope Paul VI and Ecumenical Patriarch Athenagoras I issued a joint declaration removing the excommunications of 1054 from the memory of the Church. The act opened formal dialogue but did not restore full communion, because the doctrinal questions remain.

What happened at Nicaea in 2025?

On 28 November 2025 Pope Leo XIV and Ecumenical Patriarch Bartholomew prayed together at Iznik, ancient Nicaea, for the 1,700th anniversary of the First Council of Nicaea, and recited the Nicene Creed without the filioque. On 29 November they signed a joint declaration at the Phanar affirming their common faith in the Creed and their hope for a common date for Easter.

Can Orthodox priests marry?

Married men may be ordained Orthodox deacons and priests, but a man may not marry after ordination, and bishops are chosen from celibate monks. Eastern Catholic Churches follow the same practice, while Latin Catholic priests are normally celibate as a matter of discipline.