Have you ever heard about the Epicurus paradox?

Either God wants to abolish evil, and cannot; or he can, but does not want to. If he wants to, but cannot, he is impotent. If he can, but does not want to, he is wicked. If God can abolish evil, and God really wants to do it, why is there evil in the world? — Epicurus, as quoted in 2000 Years of Disbelief