Catholic vs Mormon: Beliefs Compared, and Are Mormons Christian?

1. What Is the Difference Between Catholic and Mormon Beliefs?

The fundamental difference between Catholic and Mormon beliefs is who God is. Catholics believe in one eternal, uncreated God who exists as three Persons, Father, Son and Holy Spirit, each fully God and sharing one divine nature. Latter-day Saints believe the Father, the Son and the Holy Ghost are three distinct beings united in purpose, that the Father and the Son have glorified physical bodies, and that faithful humans can progress to become like God.

Every other difference follows. Latter-day Saints believe Christ's original Church fell into a Great Apostasy after the apostles died and was restored through Joseph Smith in 1830. They accept the Book of Mormon, the Doctrine and Covenants and the Pearl of Great Price as scripture alongside the Bible, and they follow a living prophet who can receive new revelation for the whole Church. Their highest hope, exaltation, depends on ordinances performed in temples, including eternal marriage sealings and baptisms for the dead.

Catholics believe the Church Christ founded has never failed, that public revelation closed with the apostles, and that salvation is eternal life with God in the beatific vision, where we share his life as creatures, forever.

2. Catholic vs Mormon Beliefs at a Glance

The table below sets Catholic and Latter-day Saint teaching side by side. Each row is explained in the sections that follow, with the Latter-day Saint view stated first in its own terms.

The Latter-day Saint column follows the Church's own scriptures and official teaching. Individual members may express their beliefs differently.

3. Are Mormons Christian?

Latter-day Saints sincerely consider themselves Christians, and many love Jesus deeply. The Catholic Church does not regard The Church of Jesus Christ of Latter-day Saints as a Christian church in the historic sense, because it rejects the Trinity and the eternal divinity of Christ as defined at Nicaea, and Rome does not recognise its baptism.

Both halves of that answer matter. Latter-day Saints pray in the name of Jesus Christ, believe he is the Son of God and Saviour, believe he atoned for sin and rose bodily from the dead, and put his name in the name of their Church. To call them "not Christian" without explanation sounds to them like a denial of their love for Jesus, and that is unfair.

Christianity, though, has always been defined by what it confesses about God and Christ. The Council of Nicaea in 325 settled the question when Arius taught that the Son was a created being, and the council confessed him "true God from true God, begotten, not made, consubstantial with the Father." Every Catholic, Orthodox and historic Protestant church holds that Creed. Latter-day Saint teaching does not, and Latter-day Saints themselves describe their faith as a restoration distinct from Catholic, Orthodox and Protestant Christianity. Joseph Smith's own account of his First Vision says he was told that all the existing churches were wrong and their creeds an abomination (Joseph Smith History 1:19).

So the honest Catholic answer is this: Latter-day Saints are people who follow a Jesus they love, and their account of who Jesus is differs at the root from the Christian faith of the Bible and the Creed. Say that with charity. Never say it with contempt.

4. God: The Trinity or the Godhead?

God is the deepest difference between Catholics and Latter-day Saints, and both sides agree it is.

The Latter-day Saint position, in its own terms

Latter-day Saints believe in the Godhead: God the Eternal Father, his Son Jesus Christ and the Holy Ghost, three separate and distinct beings perfectly united in purpose, love and will. Their scripture states: "The Father has a body of flesh and bones as tangible as man's; the Son also; but the Holy Ghost has not a body of flesh and bones, but is a personage of Spirit" (Doctrine and Covenants 130:22). Joseph Smith taught in 1844, in the King Follett discourse, that God himself was once as we are now and is an exalted man. A couplet attributed to Lorenzo Snow, a later Church president, puts it: "As man now is, God once was; as God now is, man may be." Church leaders in recent decades have said little about the first half of that couplet. The second half, that humans may progress to become like God, remains central. Latter-day Saints point to Jesus praying to the Father (John 17), the voice from heaven at Jesus' baptism (Matthew 3:16 to 17) and Stephen seeing Jesus standing at God's right hand (Acts 7:55) as proof of separate beings.

The Catholic answer

The Bible's first creed is "Hear, O Israel: The LORD our God, the LORD is one" (Deuteronomy 6:4). God says through Isaiah: "Before me no god was formed, nor shall there be any after me" (Isaiah 43:10), and "besides me there is no god" (Isaiah 44:6). God is eternal and unchanging: "from everlasting to everlasting you are God" (Psalm 90:2); "I the LORD do not change" (Malachi 3:6). He is "not a man" (Numbers 23:19), and Jesus himself said "God is spirit" (John 4:24). A God who was once a man and progressed to godhood cannot be the God who was God from everlasting.

Yet the New Testament also shows Father, Son and Spirit as distinct: the Son prays to the Father, the Spirit descends at the Jordan. The Church holds both sets of texts together in the doctrine of the Trinity: one God, three Persons, each wholly God, sharing one nature, distinct only in their relations to one another (CCC 253 to 255). The passages Latter-day Saints cite show three Persons. Catholics agree. The passages they cannot fit show only one God. Catholics accept both. Our guide to the Trinity sets out the doctrine fully.

5. Who Is Jesus in Each Faith?

Both Catholics and Latter-day Saints call Jesus the Son of God, Saviour and Redeemer, and both believe in his virgin birth, his atoning death and his bodily resurrection. They differ on where he comes from.

The Latter-day Saint position, in its own terms

Latter-day Saints teach that all human beings lived before birth as spirit children of Heavenly Father (and of a Heavenly Mother), and that Jesus was the firstborn of those spirits. He was Jehovah, the God of the Old Testament, chosen in the premortal council to be the Saviour. Born of Mary, he lived a sinless life, suffered for the sins of the world in Gethsemane and on the cross, rose from the dead and, according to the Book of Mormon, visited people in the Americas after his resurrection (3 Nephi 11). He is divine, and he is our elder brother.

The Catholic answer

The Catholic faith confesses that the Son had no beginning. "In the beginning was the Word, and the Word was with God, and the Word was God... All things were made through him, and without him was not any thing made that was made" (John 1:1, 3). If all things were made through him, he is not one of the things made. Jesus said "before Abraham was, I am" (John 8:58), taking the divine name. Paul says that "by him all things were created" and "he is before all things" (Colossians 1:16 to 17). Thomas answered him, "My Lord and my God!" (John 20:28).

That is why the Nicene Creed says the Son is "begotten, not made." A firstborn spirit child of an exalted Father, however glorious, is a created being. Arius taught something similar in the fourth century, and the Church answered him at Nicaea. Catholics and Latter-day Saints speak the same words, Son of God, Saviour, Redeemer, but fill them with different meaning, and that is what the 2001 baptism ruling recognised.

6. Scripture: The Bible or the Standard Works?

Catholics accept the 73 books of the Bible as the complete written Word of God. Latter-day Saints accept four "standard works": the Bible, the Book of Mormon, the Doctrine and Covenants and the Pearl of Great Price, and they believe God continues to reveal scripture through living prophets.

The Latter-day Saint position, in its own terms

The Eighth Article of Faith reads: "We believe the Bible to be the word of God as far as it is translated correctly; we also believe the Book of Mormon to be the word of God." Latter-day Saints believe that plain and precious truths were lost from the Bible over the centuries, that the Book of Mormon is another testament of Jesus Christ translated by Joseph Smith from ancient records, and that the heavens are open today as in biblical times. The Book of Mormon closes with an invitation to ask God in faith whether it is true, promising that he will manifest the truth by the power of the Holy Ghost (Moroni 10:4 to 5).

The Catholic answer

Catholics agree that God speaks today. What has ended is new public revelation. "Long ago, at many times and in many ways, God spoke to our fathers by the prophets, but in these last days he has spoken to us by his Son" (Hebrews 1:1 to 2). Jude urges believers to contend "for the faith that was once for all delivered to the saints" (Jude 3). The Catechism teaches that "no new public revelation is to be expected before the glorious manifestation of our Lord Jesus Christ" (CCC 66). Private revelations, even approved ones, add nothing to the faith.

The Bible's manuscript record also answers the charge that it was corrupted: thousands of Greek manuscripts and early translations allow scholars to reconstruct the New Testament text with great confidence. And a burning feeling cannot settle which book is scripture, because Scripture itself tells us to "test the spirits" (1 John 4:1) and praises the Bereans for "examining the Scriptures daily" (Acts 17:11). Paul warned that even "an angel from heaven" preaching a different gospel must be refused (Galatians 1:8). Our guide to the Book of Mormon covers its origins, witnesses and the historical questions in full.

7. Authority: Was There a Great Apostasy?

Latter-day Saints believe Christ's Church fell away after the apostles died and had to be restored. Catholics believe it never fell.

The Latter-day Saint position, in its own terms

Latter-day Saints teach that after the deaths of the apostles, priesthood authority was lost from the earth, doctrines were corrupted by Greek philosophy, and the creeds of the councils replaced revealed truth. This Great Apostasy was foretold, they say, in Amos 8:11 to 12 (a famine of hearing the words of the LORD) and 2 Thessalonians 2:3 (a falling away). God restored the Church through Joseph Smith: John the Baptist conferred the Aaronic priesthood in 1829, and Peter, James and John conferred the Melchizedek priesthood. The Church was organised on 6 April 1830 and today is led by a prophet and twelve apostles.

The Catholic answer

Jesus promised that "the gates of hell shall not prevail against" his Church (Matthew 16:18), that he would be with his disciples "always, to the end of the age" (Matthew 28:20), and that the Spirit of truth would be with them "forever" (John 14:16). Paul wrote of glory to God "in the church and in Christ Jesus throughout all generations, forever and ever" (Ephesians 3:21). A total apostasy means each promise failed.

The record shows no gap. Clement of Rome around the year 96, Ignatius of Antioch around 107, Justin Martyr around 155 and Irenaeus around 180 describe a Church with bishops in succession from the apostles, the Eucharist as Christ's flesh, baptism that regenerates and one God the Father Almighty. These are the same beliefs the Catholic Church holds now. Many of the bishops at Nicaea had survived persecution, and some bore its scars. They defended the divinity of Christ against Arius and held to what they had received. The "falling away" of 2 Thessalonians 2 describes a rebellion before Christ's return, which our guide to the great apostasy of 2 Thessalonians 2 explains, and the Church that suffers through it is still his Church.

8. Salvation and Exaltation

Latter-day Saints distinguish salvation, which nearly everyone receives, from exaltation, the highest glory. Catholics hope for one destiny: eternal life with God in heaven.

The Latter-day Saint position, in its own terms

Because of Christ's atonement, almost everyone will be resurrected and receive a kingdom of glory: the celestial, the terrestrial or the telestial (Doctrine and Covenants 76). Exaltation, eternal life in the highest degree of the celestial kingdom, is life with Heavenly Father as families forever, becoming like him. It requires faith in Christ, repentance, baptism, the gift of the Holy Ghost, temple ordinances and covenants, and enduring to the end. The Book of Mormon teaches "it is by grace that we are saved, after all we can do" (2 Nephi 25:23), and Latter-day Saints today stress that grace enables every step.

The Catholic answer

Catholics, too, believe the Christian destiny is breathtaking. St Peter says we become "partakers of the divine nature" (2 Peter 1:4), and the Catechism quotes St Athanasius: "the Son of God became man so that we might become God" (CCC 460). The Church means sharing God's own life by grace, as adopted children, while remaining creatures forever. In heaven "we shall see him as he is" (1 John 3:2), face to face (CCC 1023, 1028). No saint ever becomes another God alongside the one God, because there is only one (Isaiah 44:6).

Salvation is God's free gift, received through faith and baptism and lived out in love (Ephesians 2:8 to 10; CCC 1996, 2010). There is one heaven, one hell and a purification for those who die in grace but imperfect (CCC 1030). There are no secret rites needed to reach God's presence. Christ tore the temple curtain in two (Matthew 27:51) and opened the way to every baptised believer.

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9. Temples, Sealing and Baptism for the Dead

Latter-day Saint temples are sacred buildings where members make covenants and perform ordinances for themselves and for the dead. Catholic churches have no comparable restricted rites.

The Latter-day Saint position, in its own terms

Temples are distinct from the meetinghouses where Latter-day Saints gather on Sunday. Only members holding a temple recommend, which requires an interview about faith, obedience, tithing and the Word of Wisdom, may enter a dedicated temple. There members receive the endowment, a ceremony of instruction and covenants, and couples are sealed for time and all eternity so their marriages and families continue after death. Members also perform baptisms and other ordinances by proxy for deceased ancestors, who may accept or reject them in the spirit world. Latter-day Saints point to Paul's question: "what do people mean by being baptized on behalf of the dead?" (1 Corinthians 15:29).

The Catholic answer

Catholics deeply honour the love behind eternal families and care for the dead. The Catholic answer is that Christ himself said "in the resurrection they neither marry nor are given in marriage" (Matthew 22:30). Love does not end at death, and in the communion of saints we remain united with our beloved dead in Christ, so Catholics pray for them and have Mass offered for them (CCC 958, 1032). Marriage, though, is a sacrament for this life, lasting "until death do us part."

On 1 Corinthians 15:29, Paul mentions a practice to make a point about the resurrection, speaks of what "people" do, never endorses it, and nowhere else does Scripture command it. Early Christian writers mention proxy baptism only among groups outside the Church, such as the followers of Marcion. Baptism is for the living who come to faith (Acts 2:38). Because proxy baptisms draw on genealogical records, the Vatican's Congregation for the Clergy instructed dioceses in 2008 not to allow their parish sacramental registers to be copied for that purpose.

Catholic worship is public. Anyone may walk into a Catholic church, attend Mass and see every rite. Christ said "I have spoken openly to the world... I have said nothing in secret" (John 18:20).

10. Why Rome Ruled Latter-day Saint Baptism Invalid

On 5 June 2001 the Congregation for the Doctrine of the Faith answered a formal question on whether baptism conferred by The Church of Jesus Christ of Latter-day Saints is valid. The answer was "negative." Pope John Paul II approved the response and ordered it published.

The reasoning matters, because the Catholic Church accepts baptisms by Baptists, Methodists, Lutherans and Orthodox without question. A commentary published in L'Osservatore Romano, written by Fr Luis Ladaria, then a member of the International Theological Commission and later Prefect of the same Congregation, explained the decision. Latter-day Saints baptise by immersion and say the words "in the name of the Father, and of the Son, and of the Holy Ghost." The water is right and the words sound right. The meaning behind the words is different. For Latter-day Saints, Father, Son and Holy Ghost are three separate beings, which is a different God from the one God in three Persons into whom Christ commanded his disciples to baptise (Matthew 28:19). The commentary also noted that Latter-day Saints do not see baptism as removing original sin, which they do not believe in.

Baptism is the door to the Christian life (CCC 1213) and requires the Trinitarian faith of the Church. Where the doctrine of God differs at the root, the sacrament is not given. A Latter-day Saint who becomes Catholic is therefore baptised, absolutely and without condition, as anyone entering the Church for the first time.

This was no insult. It is the same respect Catholics show any religion: taking its own teaching seriously. Latter-day Saints, for their part, do not accept Catholic baptism either, and baptise Catholics who join them. Both Churches agree they believe different things about God.

11. What Catholics Can Learn From Latter-day Saints

Catholics can learn a great deal from Latter-day Saints about living faith every day, and humility requires saying so.

• Family prayer. Many Latter-day Saint families gather weekly for family home evening, with prayer, a lesson and time together. Catholic families can do the same with a Sunday evening Rosary decade and a Gospel reading.
• Fasting for the poor. Latter-day Saints fast once a month and give what they would have spent to help the needy. Catholics can revive Friday penance with the same purpose (CCC 2043).
• Missionary courage. Young Latter-day Saints spend up to two years knocking on doors. Most Catholics have never once invited a friend to Mass.
• Caring for their own. The Church's welfare system and the ministering assigned to every family mean few members fall through the cracks. Every Catholic parish can do better here.
• Keeping the body holy. The Word of Wisdom asks members to avoid alcohol, tobacco and drugs. Catholics are free to drink in moderation, and the Latter-day Saint witness to sobriety is still worth admiring.

The Catholic faith already has all of this, and has had it for two thousand years: the domestic church (CCC 1656), fasting, the missionary command (Matthew 28:19 to 20), the works of mercy. Latter-day Saints simply practise it with more discipline than many Catholics. Let their example drive you to live your own faith fully.

12. Talking With Missionaries and Family

When Latter-day Saint missionaries knock, or a family member joins or leaves the Church, speak with kindness and clarity. Here is how.

1. Be warm. Missionaries are usually young people far from home who have given up two years of their lives. Offer them water and respect.
2. Define terms first. Ask: "When you say God, do you mean the one eternal God who was never a man? When you say Jesus, do you mean the uncreated Word through whom all things were made?" Many conversations collapse because both sides use the same words differently.
3. Open the Bible together. Read Isaiah 43:10, Isaiah 44:6, John 1:1 to 3 and Matthew 16:18. Ask what they mean.
4. Share your own faith. Tell them what Jesus means to you and why you love the Eucharist. Testimony is the language they speak.
5. Never ridicule. Mocking temple garments or Joseph Smith wins no one. It only confirms what they have been told about critics.
6. If a family member is leaving the Latter-day Saint Church, be gentle. Losing a faith community can mean losing friends, family closeness and a whole way of life. Many who leave lose faith in God altogether. Show them the Christ of the Creed, and give them time.

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13. What Should You Do Today?

Do something concrete about what you have read before today ends.

• If you are Catholic: pray the Nicene Creed slowly tonight, and stop at "begotten, not made." Then read John 1:1 to 18. Then invite one person to Mass this month.
• If you are a Latter-day Saint: read the Nicene Creed and the first chapter of John's Gospel side by side, and ask God to show you who his Son is. Then visit a Catholic Mass and see the faith the early Christians died for.
• If you are questioning your Latter-day Saint faith: you are not betraying God by asking hard questions. Talk to a Catholic priest, who will listen without pressure. The free Ask tool answers questions privately.
• If you love someone on either side: pray for them by name every day.