I am very troubled by the problem of evil. Many people, such as Bart Ehrman, found atheism for the same reason, so I am not alone. Theodicy attempts to resolve the evidential problem of evil by reconciling God's traditional characteristics of omnibenevolence, omnipotence and omniscience with the occurrence of evil in the world.
However, no explanation for moral or physical evil has ever made sense to me. Traditional explanations, such as free will, effectively require of the suffering depicted in this picture.