I have mad respect for Penn Jillette, but I have to call "Bullshit!" on this (Ah! Ah! The irony! It burrrns!).

I don't think that it's right for people to say they derive all of their morality from God. I think it's foolish to say that every mundane detail of your life is predetermined and then look before you cross the street. Penn is usually pretty clever when it comes to pointing out hypocrisy with things like that. But not here. Sorry.... stopping at a red light does not make you an atheist. Penn's gotta do a lot of logical gymnastics to get to that conclusion, and the conclusion is diluted anyway by the fact that it applies to pretty much anything and everything. What I gather from this is:

Anytime you do anything yourself, it is you doing it instead of God doing it for you, right? Right. BAM! Atheist. I just think he's jumping to wild conclusions here. A person is an atheist as soon as they consciously realize they don't believe in God. It has nothing directly to do with stopping at red lights or treating injuries.

Penn Jillette is a smart man, but he takes his own opinion too far sometimes. You can say I don't believe in God, but you can't say I don't believe anyone else believes in God. That's false, and honestly quite hubristic.