Bill is actually being kind of ignorant. People unfortunately don't know the difference between factual evidence and beliefs. Belief that there is no being beyond the human mind is a belief -- just as it was a belief, and not factual evidence, that Newtonian physics was only a partial solution.
He makes a comparison to abstinence being a sexual position, but the fact is abstinence is still a sexual practice. It's certainly not a dietary nor a religious one.
People get too smart for themselves and can't even recognize when they're being stupid or when they're confusing the messenger for the message. Bill falls into that trap on this one. Atheism is a religion. It's just that people are so wound up trying to un-identify with religion that they miss when they are behaving exactly the same way.