Georgiansilver, you seem to have a very uncharitable (dare I say "unChristian") attitude toward people who believe differently than you (unless you were joking).

I've heard it suggested that God, being basically good but containing evil within himself, got rid of his evil by placing it in another being, which his good side could then defeat.

Which creates a very interesting conundrum. Because when people do this sort of thing (and they do it all the time), they project their own "evil" onto others and then do evil things to the ones onto whom they have projected their concept of evil, thus creating (or perpetuating) evil rather than eliminating or reducing it.