When you believe in God you've got to believe in the all-powerful God. He's not just God He's the all-powerful God and He has total control over everyone's life. The Devil on the other hand is a real character that's trying his hardest to tear your life apart.
The assumption that nature is all there is and that nature has been governed by the same rules at all times and places makes it possible for natural science to be confident that it can explain such things as how life began.