I'll start with... "I need not the promise of Heaven to see merit in good deeds".
And... "Adults with imaginary friends are dumb!".
When one person suffers from a delusion, it is called insanity. When many people suffer from a delusion, it is called Religion. - Robert M. Pirsig
When one guy sees an invisible man, he's a nut case. When ten people see him it's a cult. Ten million see him, it's a respected religion. - Richard Jeni
Pretty much any snarky comment Ricky Gervais has ever made on the subject. Sure Richard Dawkins, Michael Schermer, and Christopher Hitchens are wonderful at esoteric postulations for why there is no evidence of any sort of supreme being, but with Ricky Gervais, it's more like a fresh slap in the face and an admonition to not be so stupid.