if there is a godd, why is there evil

Some  philosopher believe that God's existence is incompatible with the evil  we find in the world. Summarize their reasoning to the best of your  ability. What it is about a world with evil it (like ours) that is  supposedly incompatible with God's existence? Is God's existence  incompatible with all evil or only some types of evil? Make sure to use the material in Vaughn's book to help you explain the reasoning. 

Not  all philosophers are convinced that the problem of evil proves that God  doesn't exist. Explain how the free-will defense and the soul-making  defense supposedly reconcile God's existence with the existence of  evil. For each defense, explain what you find either most compelling or  most objectionable about it, and why.