Their argument is that if God really did exist (and he was a good/omnipotent God), then evil would not exist because he would not allow it to. These people are looking for answers as to why the cruelty and evil from events such the Crusades or the Holocaust were allowed to happen. Their argument comes from a place of compassion and justice for the victims of evil and cruelty (which eventually is all of us). This is a fair question that I believe deserves an answer.
A second criticism of God is based on natural evil, rather than moral evil. The definition of natural evil here is the existence of natural disasters, disease, and pain throughout the world. People claim that the universe should not contain these natural evils, and that they are indicators that the world is not perfect. Their question is “If God is perfect, why did he not create a perfect world”? Again, this is a valid argument that deserves an appropriate