How to easily defeat any argument for God

[GrandizerII]

Which is objectively true and knowable whether or not a god exists.

That's right.

As I said, it requires additional arguments to get from objective good to God as the final cause of goodness.

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It all depends on whether it is possible for the Holocaust to be morally right in accordance with the Good. If it is, then it's arbitrary. If it isn't, then it has nothing to do with the Good/God, but something about the Holocaust act itself.

The Christian view is that there is something inherently, objectively bad about the Holocaust itself. And that it does have to do with the Good/God. 
But it requires additional arguments to get from one to the other.

Acrobat thinks they are one and the same, though. And I don't believe in final causes. I think final cause is a grave misunderstanding of how things in the universe happen. There is no end goal towards which things move toward in how they behave. Things move forward because of what they are intrinsically and the conditions at hand.

And if we say that X is intrinsically good/bad, then why do we still need to point it to God?

I'm going to check that thread you linked me to now since I'm on the bus to work.

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Why is it objectively immoral to torture babies

Because it's bad for the babies.

Bad in the sense that it has unnecessary, probably lasting, detriment to their flourishing and fulfilling their potential.

That's moral naturalism, sounds like it.