Because Mormonism contradicts the clear teachings of the Bible on the Godhead, especially, and on many other major doctrines as well, they are not considered Christian. Let’s review some of their un-biblical beliefs:
Rejection the Trinity
Although the Book of Mormon in 1830 affirmed that “there is one God” (1 Nephi 13:41), Mormonism later developed the belief of many gods (Book of Abraham 4:3). Mormonism’s founder, Joseph Smith, clearly rejected the Trinity when he wrote, “Many men say there is one God; the Father, the Son and the Holy Ghost are only one God. I say that is a strange God. . . . All are crammed into one God according to sectarianism [the Christian faith]. It would make the biggest God in all the world. He would be a wonderfully big God—he would be a giant or a monster” (Teachings, p. 372). And other Mormon writers such as James Talmage have confirmed Mormon denial of the Godhead as taught in the Bible (Articles of Faith, p.35).
The doctrine of many gods
Though Mormonism teaches that Jesus is God in flesh, it teaches that He is one of three Gods that constitute the Godhead (Articles of Faith, by Talmage, pp. 35-40). These three Gods are the Father, the Son, and the Holy Ghost. And this is in direct contradiction to what the Bible teaches that there is only One God in three persons (Isaiah 43:10; 44:6, 8; 45:5).
Man can become a god
Mormons believe that God is an exalted man who earned His divinity by good works (Mormon Doctrine, p. 321; Teachings of the Prophet Joseph Smith, p. 345). But this clearly contradicts the Bible, which states that God has existed as the God of the universe from eternity past (Revelation 1:8; 1 Timothy 1:17; 6:15–16; Psalm 102:24–27). And God was never a man (Numbers 23:19; 1 Samuel 15:29; Hosea 11:9).
Mormons also believe that humans can become gods through good works here on earth (Teachings of the Prophet Joseph Smith, p. 345–354). But the Bible teaches that no man can ever become like God (1 Samuel 2:2; Isaiah 43:10–11; 44:6; 45:21–22). This false teaching was first taught by the serpent to Eve in the garden of Eden (Genesis 3:5).
Thus, in Mormon theology, the number of gods is increasing as every man can be a god of another planet and populate it with children born to him from his eternal wife (Teachings of the Prophet Joseph Smith, 345-354). And any one of those children can later also become a god (Doctrine & Covenants 132:20).
Jesus and Lucifer were brothers
Mormons teach that Jesus is just one of many sons of God. He is considered “a son of God” (Alma 36:17). And Lucifer, or the devil, is another son of God (Mormon Doctrine, p.163). And Jesus is considered a created being, the first spirit to be born of the Father (Mormon Doctrine, p.129) and a celestial mother (Mormon Doctrine, p.516).
God is flesh and bones
Mormons teach that both the Father and the Son are men with bodies of flesh and bone, “the Father has a body of flesh and bones as tangible as man’s” (Doctrine and Covenants 130:22; Articles of Faith, p.38). This teaching is in strict contradiction to the biblical teaching that God is a Spirit Being (John 4:24), eternal (John 1:1, 2, 15), and the Creator of all (John 1:3; Colossians 1:16-17).
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In His service,