Here is something to get the brain going. It's been said that God created ALL things. Also it's been said that God is 100 precent pure/good. So God created man and it was said that because of man's sinful actions bad/evil things were created. But if God created ALL things then God created bad/evil things, not man. So by God creating bad/evil things this does not make him 100 precent pure/good.
