[wmfights]

It is in fact blasphemy.

So if the Mormons believe God was like a man before he was God and that we will evolve into Gods then they are not Christians.

[restornu]

So if the Mormons believe God was like a man before he was God and that we will evolve into Gods then they are not Christians.

That is your limited understanding and it is not acurate LDS doctrine!

Jesus was always part of the Godhead aka Jehovah in the OT before he was born on earth!

1 Tim. 3
16 And without controversy
great is the mystery of godliness:
God was manifest in the flesh,
justified in the Spirit,
seen of angels,
preached unto the Gentiles,
believed on in the world,
received up into glory.

[Bainbridge]

Obviously. This idea is blatantly contrary to any possible understanding of the Bible. It has never been believed by any Christians anywhere, anytime.
It is a novelty.