How to easily defeat any argument for God

[GrandizerII]

The Holocaust is wrong because it took the lives of a huge number of people for reasons that did not warrant it, it was a violation of human rights, etc. No reference to emotional states here (though my emotional state of disgust or anger may supplement how I view the Holocaust when I think about it).

Exactly, when you’re recognize wrong here, your not saying something about your emotional state, but about a reality external to it.

Right and wrong/good and bad when it comes to morality, at least in some cases are objective truths, about a reality external to your emotional state.

You recognize/see that good and bad in regards to morality aren’t the same as when you speak of good and bad when it comes to your taste in food, or movies. They are not expressions of your biological state.

And they aren't the same as when you speak of the sun existing, lol. Morality is exclusive to the human species; we observe certain acts, and based on how we've evolved, generally view certain aspects of these acts as right or wrong. Again, X is wrong because of something about X, not because of something "out there in the divine realm". And we come to realize X is wrong not in the sense that we see something divinely transcendent about morality, but rather in the sense that our human intuition (thanks to evolution and social conditioning) "tells" us that X is wrong (again, in accordance with something observable about X).

Evolution is mainly the reason for your moral intuition, not the Good itself.