And I respect your opinion Brian.
The truth is, none of them have proof, perhaps it is just human nature that we need to believe something. It makes us stronger, believing that we can do something usually means we can. So if you believe someone will help you doing something, you will be able to do it due to willpower. This would mean the non-religious humans would die [because the religious ones are stronger -- survival of the fittest] and the religious ones would grow to teach their offspring of their religion...
...I could be wrong.