Somehow, Christians seem to think it makes sense, arguing that I cannot be sure if logic and reason are valid. Yes, that may be true, but we all have to assume they are, because the alternative is assuming that we live in a world that doesn’t make any sense at all – and that includes religion, because without logic and reason, assuming that reading a book tells you the content is NOT valid. Every second, everything could turn green. Or nylon. Or whatever. We have to assume that logic and reason are really valid, because a) it seems that way and b) the alternative is insanity. Perhaps there are better philosophical explanations, but for me, that’s totally enough.
So, one simple rule: As soon as you start questioning logic and reason itself, I will consider you insane and stop talking to you. There’s no help for you and I will not follow you down into your mad place. Only if we both agree that logic and reason are valid, we can discuss. Otherwise, it’s completely pointless.