The Church of Jesus Christ of Latter-day Saints
Mormonism was founded in 19th-century America by Joseph Smith Jr. While it uses Christian terminology and considers itself a restoration of original Christianity, mainstream Christians view it as a fundamentally different religion due to radical theological departures. Smith claimed that God the Father and Jesus Christ appeared to him, stating all existing churches were corrupt. He later claimed an angel led him to golden plates, which he translated into the Book of Mormon. Mormonism teaches that historic Christianity fell into a "Great Apostasy" and that Smith restored true priesthood authority and doctrine. They utilize a quadruple canon: the Bible (only "as far as it is translated correctly") alongside three unique Mormon texts. Theologically, Mormonism breaks from Christian monotheism. It teaches that God the Father was once a mortal man who progressed to godhood, and that humans can also achieve exaltation to become gods. Jesus is viewed as the first spirit child of Heavenly Father, a separate god, and the literal spirit brother of Lucifer. Salvation involves grace but heavily relies on works and unique temple ordinances (like secret endowments and baptism for the dead) to achieve the highest heaven.
The Father, Son, and Holy Ghost are three distinct, separate gods. God the Father has a physical body of flesh and bone.
The belief that God was once a man, and that worthy Mormons can become gods themselves, creating their own worlds.
The claim that true Christianity vanished from the earth after the apostles died and was only restored through Joseph Smith.
Belief in continuous revelation through a living prophet. New scriptures and revelations can alter or supersede past doctrine.
Secret rituals performed in Mormon temples (endowments, eternal marriage, proxy baptism for the dead) are essential for exaltation.
Christianity teaches that God is Spirit, eternally self-existent, and the uncreated Creator of everything (Isaiah 43:10, Psalm 90:2). Mormonism teaches that God the Father was once a mortal man on another planet who earned godhood. This fundamentally destroys the Creator-creature distinction. Christianity holds to the Trinity (One God in three Persons); Mormonism is polytheistic, teaching the Father, Son, and Spirit are three separate gods among countless others.
In Christianity, Jesus is the eternal, uncreated God the Son, equal with the Father (John 1:1). In Mormonism, Jesus is a created being — the firstborn spirit child of Heavenly Father and Heavenly Mother. Shockingly to Christians, LDS theology teaches that Jesus and Lucifer (Satan) are spirit brothers. They honor Jesus as Savior, but He is a lesser deity who had to progress, not the one true God incarnate.
Mormonism's ultimate goal is exaltation — humans becoming gods of their own planets. Orthodox Christianity views this as repeating the original deception in Eden ("you will be like God"). Christians believe redeemed humans will be glorified and live eternally with God, but we will always remain creatures worshiping our Creator, never becoming equal to Him.
Mormon scripture states "it is by grace that we are saved, after all we can do" (2 Nephi 25:23). Achieving the highest level of heaven (Celestial Kingdom) requires obeying LDS laws, paying tithing, and performing temple rituals. Christianity teaches that our works can never save us; salvation is a free gift received by faith alone in Christ's finished work on the cross (Ephesians 2:8-9, Romans 4:5).
Christianity holds the Bible as the supreme and final authority. Mormonism adds new scriptures that contradict the Bible and relies on modern prophets whose teachings can change. Christians point out that the Book of Mormon lacks any archaeological support and that the Bible warns strongly against adding to God's Word or accepting "another gospel" (Galatians 1:8).
"Why wouldn't God continue to speak through modern prophets?"
God has given His ultimate and final revelation in His Son, Jesus Christ (Hebrews 1:1-2). The New Testament contains the complete foundation laid by the apostles. While the Holy Spirit still guides believers, He does not give new doctrines that contradict the Bible. Point out that Joseph Smith's "revelations" radically changed the nature of God taught in the Bible, running afoul of the warning in Deuteronomy 13 about prophets leading people to "other gods."
"Doesn't James 1:5 say we should pray to know the truth about the Book of Mormon?"
Mormon missionaries often urge people to pray for a "burning in the bosom" feeling to confirm their message. However, the Bible says the heart is deceitful (Jeremiah 17:9) and we are commanded to test all spirits and teachings against Scripture (Acts 17:11, 1 John 4:1). Truth is determined by God's objective Word, historical evidence, and reason, not just subjective feelings. The Book of Mormon has significant historical and theological flaws that prayer does not erase.
"We are Christians too; we believe in Jesus Christ."
Acknowledge their sincerity and high moral standards, but clarify that using the same words does not mean having the same dictionary. The "Jesus" of Mormonism (a created spirit brother of Lucifer) and the "God" of Mormonism (an exalted man among many gods) are fundamentally different from the Jesus and God of the Bible. Paul warned against those preaching "another Jesus" and a "different gospel" (2 Corinthians 11:4). True Christianity is defined by historical, biblical orthodoxy, which Mormonism explicitly rejects.
When engaging Mormons, remember they are often highly dedicated, moral people who believe they are following Christ. Do not attack them personally; instead, lovingly contrast the heavy burden of their works-based system with the true freedom of Christ's grace. Many former Mormons testify that discovering the biblical truth of salvation by grace alone was liberating. Focus the conversation on the true nature of God and the sufficiency of Jesus' atonement. "It is finished" (John 19:30) — we don't need secret handshakes or extra rituals, just faith in the eternal Son of God.