The most interesting questions are the ones that you can't ask. But, if you're adventurous:

Does religious wisdom come more easily to people of certain intelligence, race, religion, and/or political persuasion? (Related: are the wisdoms of different religions culturally-dependent, or universal?)

For those who are able, how best is it to develop religious wisdom? Is this entirely divorced from training in epistemic and instrumental rationality?

What is your favorite argument(s) against the existence of God?

Is widespread public atheism, homosexuality, abortion, etc. necessarily a sign of civilizational decline?

Is superintelligence possible? If/when it happens, would it be proper to refer to such a being as a God?

Briefly explain the b******k and ask if their God is as vengeful.

Can your particular creed survive another thousand years, provided that humanity can?

Given you, your philosophy friends, and a bunch of math experts, how long would it take to transform your theses into something that atheist scientists would care about?

If your God were made flesh, would he best resemble Jesus, Zeus, or Cthulhu?