Are you serious right now? There is a separate theory for this! I've said it a million times. Abiogenesis. They are separate. They always have been. The only people using evolution as propaganda are the Christian Right.
Evolution = how single cells evolve into humans
Abiogenesis = how the cells came to be in the first place
I understand science the same way I understand math. I don't believe in evolution like I don't "believe" in the order of operations in mathematics. I know both of them work. Atheism is not a religion, evolution is not something you believe in, it is something everyone except the misinformed understand.