Look, here's the thing — every civilization in history has had some concept of a higher power. That's not an accident. The moral law we all feel inside, that sense of right and wrong that transcends cultures, points to a moral lawgiver. Without God, you're left with either pure relativism or trying to ground morality in evolutionary biology, and neither works. If there's no ultimate standard, then Hitler wasn't objectively wrong — you just didn't like what he did. But we all know that's nonsense. The Christian God specifically makes sense of why the universe has order, why we have consciousness, and why we experience guilt rather than just pain. It's the most coherent explanation we've got.

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The contradiction you raise is the strongest objection. I'd frame it this way: imagine an author writing a villain. The author isn't the villain, and the villain's evil doesn't make the author evil. A perfect God creating free creatures who do imperfect things isn't a contradiction. Your symmetry fails too: evil is a privation, not a substance. An all evil god couldn't create anything, since existence and order are goods. So the Christian God remains the more coherent first cause.