God permits evil because he can use other people's testimony of how they got saved from some of the evil action's of people and taught them new things through what had happened to them. He can also turn something negative into someone's life into a positive. You also have to understand that God has a purpose for all things even the evil in this world.

God didn't create sin. Humans are the one's who let evil and sin into this world by disobeying God.

Evil came about when humans let sin into this world. God was the first to exist but there was no sin when God was existing in the world. It only came when Adam and Eve disobeyed God.

God didn't create evil. The very first humans Adam and Eve, they let sin get into this world and that is why the world is broken because of sin. If they followed what God told them to do then there wouldn't be evil in the first place or sin.