Admittedly I do have a limited understanding of Mormonism. However, God in man Jesus preexisted from before the creation of the universe and did not "evolve" from his manhood into a God.
If as has been stated here that Mormons believe God was once a man and "evolved" into God that is clearly not Scriptural. If I'm in error about this Mormon belief please let me know what the actual belief is.
It seems when one hears something they are not familar such as in the King Follett Sermon, its human nature people want to fill in the pieces.
Just as Jesus was always perfect before he incarnated as we read in
John 5
19 Then answered Jesus and said unto them, Verily, verily, I say unto you, The Son can do nothing of himself, but what he seeth the Father do: for what things soever he doeth, these also doeth the Son likewise.
20 For the Father loveth the Son, and sheweth him all things that himself doeth: and he will shew him greater works than these, that ye may marvel.
21 For as the Father raiseth up the dead, and quickeneth them; even so the Son quickeneth whom he will.
22 For the Father judgeth no man, but hath committed all judgment unto the Son:
23 That all men should honour the Son, even as they honour the Father. He that honoureth not the Son honoureth not the Father which hath sent him.
Even though this observation from the prophet Joseph Smith is intriguing there is no record of the King Follett couplet ever been canonized.