No argument from me. We exist at his pleasure.
I was unaware that Mormons believed God "evolved" from being a mere man.
Now this doesn't sound too good. So the church is finessing it, and revising and developing and denying it and the verbal gymnastics required are absurd. But if you do some basic research you cannot avoid the fact that this is a foundational belief of the LDS church. And so no, they are not Christian.
That's because it's not true. It's one of many things the anti Mormons put out there to distort our faith.