To be absolutely fair, an omnipotent being would define morality, so technically YOU would be immoral even if said being supported -blam!- slaves or something and you didn't.
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Well my definition of morality would ultimately be superior, making the existence of the christian god impossible, hey I just figured out how to disprove god, yessssss!
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I mean, the omnipotent deity would by definition be superior to you and all your thoughts, so yeah...
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So the christian god cant be omnipotent....
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Well he doesn't exist so yeah.