He's not evil, he's just being portrayed as evil by the establishment.
He's the one who "tricked" us into eating the apple and freeing us from being the mindslaves to God.
He's killed less than a dozen people. God has killed off the entire planet at least once. He was even a dick and knew Lot's wife was going to look at the cluster-blam!-ing of Sodom and Gramorha, told her not to, and turned her into a pillar of salt anyways when she did.
I mean when you get right down to it: Satan is the good guy compared to God.
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God is the potter and we are the clay. If God makes us and brings us into the world he has the right to do whatever he wants with what he makes and is Just doing so.