How does free will come into play? If God granted free will then he must allow for evil to exist. If God does not allow evil to exist, then there is no free will. Satan wasn't and won't be destroyed. He will be bound for 1000 years, then allowed out for a period of time, but never destroyed. If God destroyed Satan then he would become Satan. God wants you to join him in goodness, but also needs to allow for evil or he wouldn't be good anymore.