Why don't religious people answer questions clearly pointed at them?

I think a lot of people don't feel comfortable answering questions about their religion because they simply don't know enough. I know so many people who claim to be religious but don't have any real basic knowledge beyond what their pastor has said, or pat answers they learn but can't explain. It can be very frustrating. However, it's also possible that people don't answer because they know it's going to turn into a heated argument no matter what they say, and simply don't want to be involved in such things. I've seen quite a few "questions" around here that were really just bait trying to reel in people to argue with. Personally, I quite often answer people who have questions about my religion. There have been quite a few "What is a pagan?" questions, and I've answered several of them. =)