A god that is made of anything can be affected by some thing, even if not matter. The only god that can be omnipotent on that score then is one that isn't composed of something, or in other words, one that doesn't exist. I think all you've managed to prove, by definition, is that an omnipotent god cannot exist. Why your definition is presumed to be correct, I don't know. It seems counterproductive.
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