How do you respond to the "trivia" or "only God knows" type questions which cannot be answered from the Bible or science (yet)? This is more of a general question, such as do you blow them off or provide a generic "Only God can truly know the answer to that, and I have faith that he does" type answer?
For example (you don't have to answer these ;) ):
My general response is to redirect the questioner to what their real issue is - most often, these questions are asked as a way of attacking fringe aspects of Christianity, and the real issue the questioner has is at his heart: he's not yet saved, and is scared that God's not happy with him, so to make himself feel better, he posts strawman and fringe-topic questions to make the Christian he is speaking with look like an idiot.
Most of them contain logical fallacies, like the one you mentioned "Can God make a rock He can't move?" In other hand a valid "trivia" gives an opportunity to test your faith. Personally I wouldn't like to know that there is answer to any question. This give great meaning when I talk with other people, with honest motivation, about a topic which is not very clear with result to have great discussions and exchange of different opinions and views.
