Atheism, evil and purpose

A favourite atheistic argument is that God cannot exist because of the evil in the world. Yet, An atheist cannot use this argument that evil proves that God does not exist, for the following reason: the atheist believes that the universe has no purpose, and if no purpose then evil cannot exist, because evil is a “purpose-driven” concept.

Humanism spends much energy on trying to prove that the universe has no purpose while also advocating that the greatest purpose for man is to do good. What kind of meaningful life is this – meaningful because the desire to do good is surely meaningful? I answer an absurdly meaningful life, or perhaps it is better to say a meaningless absurd life.