God may be immutable and consistent. But man's ideas about God are not. Indeed, very few groups on earth agree on exactly what God is saying in the Bible, even though they live at the same time. Then study the history of Christian theology, what Christians believed prior to the Civil War, the reformation, on and on. Nothing is consistent about what man believes about God.
I believe that God is consistent. But to think that what you believe about God is consistent with anyone around you, or any time in history is delusional.
My ideas about evolution, and that it does not conflict with Genesis were taught me at a church youth camp by a deacon in the Southern Baptist Church. His day job was a science professor, and the church had no problem with what he taught. My children now attend in the same general congregation, but now they preach Darwin hate and ID. They don't believe me that I wasn't taught the same thing.
God is immutable. Your belief is not.
Most of your post I agree with. God does not change. Humans are fallible and misinterpret Scripture.
But that does not change the fact that removing the unique creation of man denies the truth of all of Scripture.