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 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.
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).