It comes in many faces and strengths - and logics. One book defines faith as believing in things one cannot see, etc. I think that same book said something about 'don't waste your time with useless debate'. If it's any encouragement, you are not legally, morally, or ethically obliged to even answer. If someone will think ill of your choosing more constructive use of your time than answering, then that someone probably has no respect for others, and it's all the more reason not to bother with them. :)