Following Jesus or Follow Atheism?

Paul Copan, in his new book Is God a Moral Monster? writes:

If we'd stop to ask, "Would Jesus approve of the Inquisition or persecuting Jews?" the question answers itself. As a counterillustration, what about serial murderer and cannibal Jeffrey Dahmer? Dahmer reasoned, "If it all happens naturalistically, what's the need for a God? Can't I set my own rules? Who owns me? I own myself." He wondered, if there's no God and we all just came "from the slime," then "what's the point of trying to modify your behavior to keep within acceptable ranges?" (p. 18)

Loving people or killing people: These are the logical and natural outworkings of the two worldviews, whether one follows through with them or not.