[Religious people have caused untold death and suffering throughout history. Brush up on your history.]

Just because history is on my side doesn't mean that you need to ask me to go back and read history.

Think of it this way, the "why do you act in a moral manner" function is recursive. You're trying to make your way to the exit condition. You will never exit the recursive loop with an atheist world view. This is because "Because I said so." isn't a valid exit condition. That would be because anyone can apply that ambiguously and after that there really isn't much left to talk about is there? That's the point I'm trying to make. It is an ends versus means argument and doesn't make the case for a creator or any deity. The majority of people can instantly see the case for a creator based on the contingency of existence. The debate comes down to the nature of the creator/creative force, etc. But out of this debate comes practical issues. Issues that many atheists who are actually very interested in moral behavior (that's a good thing), cannot adequately side step.