The issue of evil 5

This seems to be a practical issue. With a God centered religion that lacks Satan, where does sin come from? Does the existance of evil prove that God is evil? With no original sin, why is humanity so depraved at times? The answer lies in the fact that God gave people free will. Because we have the ability to make our own choices, we tend to make the wrong choices. Often. God allows evil to exist and flourish as a means to test our spirits and to refine human beings as one refines gold. It is a test on both the evil doer- who should have resisted temptation in the first place, and on the victim-to test their faithfulness.
One should not befriend an evil-doer.