Tritheism is the teaching that the Godhead is really three separate beings forming three separate gods. This erring view is often misplaced by the cults for the doctrine of the Trinity which states that there is but one God in three persons: Father, Son, and Holy Spirit. The doctrine of the trinity is, by definition, monothestic. That is, it is a doctrine that affirms that there is only one God in all the universe.
Tritheism has taken different forms throughout the centuries. In the early church the Christians were accused of being tritheists by those who either refused to understand or could not understand the doctrine of the Trinity. In the late 11th century a Catholic monk of Compiègne in France, Roscelin considered the three Divine Persons as three independent beings and that it could be said they were three gods. He maintained that God the Father and God the Holy Ghost would have become incarnate with God the Son unless there were three gods.
Present day Mormonism is tritheistic — but with a twist. Mormonism teaches that there are many God’s in the universe but they serve and worship only one of them. The godhead for earth is to them really three separate gods: the Father, the Son, and the Holy Ghost. The Father used to be a man on another world who brought one of his wives with him to this world – they both have bodies of flesh and bones. The son is a second god who was literally begotten between god the father and his goddess wife. The holy ghost is a third god. Therefore, in reality, Mormonism is polytheistic with a tritheistic emphasis.
Of course, tritheism clearly contradicts the teaching of the Bible regarding monotheism:
“You are My witnesses,” declares the Lord, “And My servant whom I have chosen, In order that you may know and believe Me, And understand that I am He. Before Me there was no God formed, And there will be none after Me,” (Isaiah 43:10).
“Thus says the Lord, the King of Israel And his Redeemer, the Lord of hosts: ‘I am the first and I am the last, And there is no God besides Me,” (Isaiah 44:6).
“Do not tremble and do not be afraid; Have I not long since announced it to you and declared it? And you are My witnesses. Is there any God besides Me, Or is there any other Rock? I know of none,” (Isaiah 44:8).