Joseph Smith was clear only ONE GOD exists pre-1836
2 Nephi 31:
21 And now, behold, my beloved brethren, this is the way; and there is none other way nor name given under heaven whereby man can be saved in the kingdom of God. 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.
Alma 11:
44 Now, this restoration shall come to all, both old and young, both bond and free, both male and female, both the wicked and the righteous; and even there shall not so much as a hair of their heads be lost; but everything shall be restored to its perfect frame, as it is now, or in the body, and shall be brought and be arraigned before the bar of Christ the Son, and God the Father, and the Holy Spirit,
which is one Eternal God, to be judged according to their works, whether they be good or whether they be evil.
Mormon 7:
7 And he hath brought to pass the redemption of the world, whereby he that is found guiltless before him at the judgment day hath it given unto him to dwell in the presence of God in his kingdom, to sing ceaseless praises with the choirs above, unto the Father, and unto the Son, and unto the Holy Ghost,
which are one God, in a state of happiness which hath no end.
The Testimony of Three Witnesses
And the honor be to
the Father, and to the Son, and to the Holy Ghost, which is one God. Amen.
Oliver Cowdery
David Whitmer
Martin Harris
1 Nephi 13: 41 And they must come according to the words which shall be established by the mouth of the Lamb; and the words of the Lamb shall be made known in the records of thy seed, as well as in the records of the twelve apostles of the Lamb; wherefore they both shall be established in one;
for there is one God and one Shepherd over all the earth.
Doctrine and Covenants 20 :
28
Which Father, Son, and Holy Ghost are one God, infinite and eternal, without end. Amen.
1 John 5:7 For there are three that bear record in heaven: the Father, the Word, and the Holy Ghost;
and these three are one. Joseph Smith translation
Moses 1:6
6 And I have a work for thee, Moses, my son; and thou art in the similitude of mine Only Begotten; and mine Only Begotten is and shall be the Savior, for he is full of grace and truth;
but there is no God beside me, and all things are present with me, for I know them all.