God isn't a 'man is the sky'. He is a spiritual being in heaven, which is not on earth and probably not in this universe. Your assumptions about Christianity are very cliche and unrealistic if that's what you think we believe.
Okay, but it says that God spoke and these things came into being, not that they came from other living things. Also, the word used for 'day' consistently refers to a 24-hour day. To believe in evolution is to believe that God is hiding something from us when He tells us how the world was created. There is no actual scientific evidence for evolution. We have not observed evolution in the thousands of years we have been around, and we have yet to find a complete fossil record. If you are a Christian, you have to trust what is in God's word: that He spoke things into existence. To do otherwise is to not trust Him, but to trust man.