It might be hard to imagine but up intil 1840 ish the mormons believed in the trinity it was endorsed by smith the founder...
ook of Mormon (1830):
And now, behold this is the doctrine of Christ, and the only and true doctrine of the Father, and of the Son, and of the Holy Ghost, which is one God, without end. Amen" (2 Nephi 31:21; emphasis added).
And Zeezrom said unto him: Thou sayest there is a true and living God? And Amulek said; Yea, there is a true and living God. And Zeezrom said: Is there more than one God? And he answered, No. Now Zeezrom said unto him again: How knowest thou these things? And he said: An angel hath made them known unto me (Alma 11:26-31; emphasis added).
Doctrine and Covenants:
In the early sections of the LDS scripture, Doctrine and Covenants, are clear teachings that there is only one eternal God:
By these things we know that there is a God in heaven, who is infinite and eternal, from everlasting to everlasting the same unchangeable God, the framer of heaven and earth, and all things which are in them. . . . Which Father, Son, and Holy Ghost are one God, infinite and eternal, without end (20:17; 1830; emphasis added).1
Smith wrote the Book of Mormon by 1830 and these early sections of Doctrine and Covenants were written in the same year. However, when we read the later sections we find that Smith's teaching of one God radically changed:
Then shall they be gods, because they have no end; therefore they shall be from everlasting to everlasting, because the continue; then they shall be above all, because all things are subject unto them. Then shall they be gods, because they have all power, and the angels are subject to them (132:20; 1843; emphasis added).
Pearl of Great Price:
We also find this doctrinal switching in the LDS scripture Pearl of Great Price. In the first book of the Pearl of Great Price is the book of Moses. The book of Moses text is an excerpt from Smith's own translation of the Bible called the Inspired Version,2 which is from 1830.
And I, God said: Let there be light . . . And I, God saw the light . . . And I, God called the light Day; and the darkness, I called Night. . . . (Moses, 2:3-5; emphasis added)
And I, God made two great lights . . . And I, God set them in the firmament of the heaven . . . And I, God, said; Let the waters bring forth abundantly the moving creature that hath life. . . . (ibid., 16-17, 20; emphasis added).
However, when you turn to the next book (Abraham) in the Pearl of Great Price, you find something very interesting. When we compare the same verses in Abraham (ch. 4 was penned in 1842) with the book of Moses (penned in 1830) we find Smith's doctrinal switching most obvious:
And they (the Gods) said: Let there be light . . . And they (the Gods) comprehended the light. . . . And the Gods called the light Day, and the darkness they called Night. . . . (Abraham, 4:3-5; emphasis added).
And the Gods organized the two great lights . . . And the Gods set them in the expanse of the heavens
And the Gods said: Let us prepare the waters to bring forth abundantly the moving creatures that have life. . . . (ibid., 16-17, 20; emphasis added)
These are only a few examples of the verse-to-verse comparisons of the book of Moses (ch. 2) and Abraham (ch. 4).
The point is: the word "God" is singular throughout Moses chapter 2 and in the book of Abraham, which is, almost verbatim, the same account as in Moses, the word "God" is changed to "Gods" ("Gods" 47 times in ch. 4). Keep in mind that Smith penned this section of the book of Abraham in 1842 and Moses is from 1830.
Joseph Smith started out, in 1830, teaching that there is only one God but by 1844, Smith is declaring full-blown polytheism (i.e., many Gods):
I will preach on the plurality of Gods
I have always and in all congregations when I have preached on the subject of Deity, it has been the plurality of Gods. . . . Jesus Christ a separate and distinct personage from God the Father, and that the Holy Ghost was a distinct personage and a Spirit: and these three constitute three distinct personages and three Gods (Joseph Fielding Smith, ed. Teachings of the Prophet Joseph Smith, 370; given August 15, 1844; emphasis added).
Here then, is eternal life--to know the only wise and true God; and you have got to learn how to be Gods yourselves, and to be kings and priest to God, the same as all Gods have done before you, namely by going from one small degree to another, and from a small capacity to a great one. . . . (ibid., 346; emphasis added).