I'm coming up with 25 hot topics for a Christian scholar and I to discuss in a book. I think I'll separate my questions into different categories: science, epistemology, ethics, history, psychology, Bible, theology (soteriology, Jesus, eschatology, hermeneutics), and so forth. This particular scholar is a new breed of evangelical who won't be caught off-guard with your typical fundamentalist stumpers. Thanks for all your suggestions so far. Don't assume if I use what you suggest that I didn't already think of it.