“With or without religion, good people can behave well and bad people can do evil; but for good people to do evil—that takes religion.”
Nonsense. Religion, as an expression of the Moral Law, is what allows us to tell the difference between good and evil behavior. Without that light, good and evil degenerate to the simple wants of the observer. In short, there is always a "valid" excuse for even the worst evil and a "true" argument against the greatest good.

