From Roger Olson’s Evil As Signal of Transcendence:
The language and conceptuality of evil belongs within a theistic frame of reference. Atheists who use it are simply living off the leftovers of theism. Like my insightful atheist interlocutor here, they ought to discard it. But who can seriously refer to the Holocaust as a “mistake” or “harmful” or “pathological” without going further and calling it also evil? Sure, some will attempt it, but I dare them to have that conversation with a survivor of Auschwitz. And once you utter “evil” and mean it seriously, God is at least on the horizon. For without God (or something very much like God whatever you prefer to call him or it) evil falls back into being only a human value judgment which sucks the very power from it.