it's not appropriate to post arguments for religious faith here at all.

Agreed, with reservations. (Some might be useful examples. Some might be sufficiently persuasive prima facie to be worth a look even though we'd be astonished if they turned out actually to work.)

if you don't understand why theism is ruled out, you're not ready to post here at all.

If theism were just one more thing that people can easily be wrong about, perhaps you'd be right. As it is, there's huge internal and external pressure influencing many people in the direction of theism, and some people are really good at compartmentalizing; and as a result there are lots of people who are basically good thinkers, who are basically committed to deciding things rationally, but who are still theists. I don't see any reason to believe that no one in that position could have anything to offer LW.

Once again: Would you want to keep out Robert Aumann?