Atheists and all others who embrace naturalism for all their answers also have a problem with evil. Their problem is that the natural world has no good or evil. When a lion kills a zebra the lion is not evil only acting as a lion should. When a hurricane strikes land it is neither good nor evil it is just a natural event. Nature just is. It has no evil or good. So, if nature is morally neutral where does that leave one? In a quandary if you subscribe to the naturalist theory of everything.
If everything is natural and there is no creator then the very question of why there is evil is meaningless. Matter is neutral, it is neither good or evil it just is. Now no one I know believes that there is no such thing as evil. Everyone no matter how wedded to naturalism will admit at some point that evil exists. Just the fact that the question of evil is used to try and disprove God shows that they recognize the existence of evil.
There is a commonality among various societies throughout history as to what is morally acceptable and what is not. While each society may define and action slightly differently they all see murder, lying and theft as wrong. Some might say any taking of human life is wrong while most make exception to killing in war or protecting another. I am unaware of any society that condones murder.
So where does this moral commonality come from? Nature? We can already see that nature is morally neutral. Atoms, chemicals and molecules have no intrinsic morality, so how can they gain some moral code by stacking them together or arranging them in a particular order? The fact is they don’t. We see this all over nature moral neutrality, neither good nor evil. Good and evil in nature only comes from out attempt to anthropomorphize nature.
Try as they may the atheist and naturalist have yet to come up with a compelling theory as to how we know good from evil. The theist shows that morality comes from a higher authority, God the moral law giver; the non believer can point to no common moral arbiter. They can show no common source for morality. These things that are outside the natural world are particularly hard to explain by solely natural causes. Another example is the mind.
Morality, altruism and the mind, all things every person knows to exist and each, I think, impossible to explain in a naturalistic manner. Christianity has an explanation for evil. Christianity has a moral law giver. The natural world has no answers for these things.
Have a blessed day,