Penn gets to make such comments as he is a comedian / magician and not someone writing a philosophical opinion on the validation of the existence of God. His assertion has no feet and can not stand against critical inquiry but it makes a great comedy routine. There are certainly anti-theists out there who like to shove both feet in their mouth and babble like believing Christians. Before you make the claim that “this” or ‘that’ god does not exist, it would do you well to know exactly what god you are talking about.
If I tell you that my god exists and you profess it does not, you automatically lose. I worship the sun. End of game and you look like an idiot. The sun exists. "Whether or not it exists as a ‘god’ whatever that is, need not be defended. I choose to worship it and that is all you need to know for me to prove my point. “Why call it ‘god?’” Well, you don’t have to. The sun exists now go the fuck away. I do not have to defend my belief to you or share with you any knowledge that I may have that you may not.