Christianity vs. Mormonism
Last updated: 2026-04-13
Mormonism, or The Church of Jesus Christ of Latter-day Saints, holds beliefs that significantly diverge from historic, biblical Christianity, particularly regarding the nature of God, the deity of Christ, and the sufficiency of the gospel. While they utilize Christian terminology, their foundational doctrines—such as the belief in a plurality of gods and the necessity of works for exaltation—stand in direct opposition to the Reformed witness to the triune God and salvation by grace alone through faith alone.
📖 The Nature of God and the Trinity
The historic Christian faith, as articulated in the Second Helvetic Confession, maintains that God is one in essence and nature, eternally subsisting as three distinct persons: Father, Son, and Holy Spirit. This is grounded in the clear testimony of Scripture: Deuteronomy 6:4, "Hear, O Israel: Jehovah our God is one Jehovah" (ASV). Mormonism, by contrast, teaches that the Father, Son, and Holy Spirit are three separate beings, and that the Father was once a man who progressed to godhood. This contradicts the biblical revelation that there is no God besides Him, as seen in Isaiah 45:5: "I am Jehovah, and there is none else; besides me there is no God" (ASV). We affirm that God is immutable and eternal, not a being who evolved or progressed into divinity.
Sources: Second Helvetic Confession Ch. III · Deuteronomy 6:4 · Isaiah 45:5 · Second Helvetic Confession
✝️ The Sufficiency of Christ and the Gospel
The Reformed tradition, following the Heidelberg Catechism Q. 29, asserts that we must seek salvation in no other than Jesus Christ, who is the eternal and only begotten Son of God. Mormonism suggests that salvation or exaltation is achieved through a combination of Christ's grace and personal obedience to the laws and ordinances of their church. However, the gospel of Christ is that we are accepted in Him merely by grace, without any merit of our own (Heidelberg Catechism Q. 60). To suggest that we need to add to Christ's finished work is to deny His role as the complete Savior. As our Lord declared in John 14:6: "Jesus saith unto him, I am the way, and the truth, and the life: no one cometh unto the Father, but by me" (ASV).
Sources: Heidelberg Catechism Q. 29 · Heidelberg Catechism Q. 60 · John 14:6
Christians distinguish Mormonism from historic Christianity primarily because of its rejection of the classical doctrine of the Trinity and the uniqueness of the gospel of grace. While denominations within historic Christianity may differ on secondary matters of ecclesiology or sacraments, they share a common confession of the one, triune God and salvation solely through the finished work of Jesus Christ.
📖 The Nature of the Triune God
The historic Christian faith, as summarized in the ecumenical creeds and Reformed confessions, maintains that there is only one living and true God, eternally existing in three distinct persons: Father, Son, and Holy Spirit (Westminster Larger Catechism Q.8). The Second Helvetic Confession Ch. III clarifies that these persons are consubstantial, coequal, and coeternal, and it explicitly rejects as heresy any view that suggests a plurality of gods or a subordinate status within the Godhead. Because Mormonism posits that the Father, Son, and Holy Spirit are separate beings and that humans may progress to godhood, it departs from the foundational Christian teaching that God is one in essence and that the distinction between Creator and creature is absolute.
Sources: Westminster Larger Catechism Q.8 · Second Helvetic Confession Ch. III
✝️ The Gospel of Grace Alone
The divide goes beyond theology proper to the very heart of the gospel. The Reformed tradition affirms that salvation is by grace alone through faith alone, apart from our works (Ephesians 2:8-9). The gospel is the announcement of what God has achieved for sinners in the life, death, and resurrection of Christ, not a system of steps for human achievement. When a movement teaches that salvation or exaltation requires human cooperation and works to reach a higher state, it contradicts the sufficiency of Christ's work and the biblical assurance that we are accepted because of His righteousness, not our own. As Scripture says, "For by grace have ye been saved through faith; and that not of yourselves, it is the gift of God; not of works, that no man should glory" (Ephesians 2:8-9).
Sources: Ephesians 2:8-9
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