If you want him to leave you alone, ask a question that he doesn't have a sensible answer for, then refuse to let him weasel his way out of giving you an answer. Make him feel guilty for every trick he uses to fool you.
If he ever tries to talk about a different Bible subject, inform him that he hasn't answered your original question and you want to know why .... right now .... plus you still want it answered .... now would be a good time.