It’s important to understand that even though atheists and agnostics can be “moral,” they have no ultimate authoritative basis for their morality. When an atheist or agnostic calls something “right” or “wrong” or “good” or “evil,” they are borrowing from a biblical worldview in order to make that statement. Think about it: If we are simply the by-product of evolution and no better than animals, then why should anyone behave morally? In that case, what or who defines right from wrong? Ultimately, this kind of thinking leads to “everyone doing what is right in his own eyes” (Judges 21:25), which is exactly where our culture is rapidly sliding.