Finally, "Is he neither able nor willing? Then why call him God?" The truth is that if a person creates something, he is able to destroy it as well. So, God is both willing and able to destroy evil, but he cannot force mankind to be his slaves. He must allow them to act for themselves, because they have the power within themselves to destroy evil.
In truth I think the question that Epicurus should have asked was this: "Who is responsible for evil, Man or God?" Allow me to answer the question with other questions. Does God make people lie? Does he make people steal? Does he cause people to commit murder? Does he cause wars? Is he the author of child abuse? Or is humanity responsible for all those things?
The natural man is an enemy to God and seeks to blame Him for the problems he has caused himself. The Problem of Evil is indeed a true problem, but it not God's problem. It is our problem.