Problem 2: I'd work on finding out what criteria we were using. In general, I believe that I can tell when I'm going off balance. I'm not sure if I can test this, but I get the impression that most people have no clue at all about when they're going off balance. I will also note that even if I feel I'm going off balance, there may not be anything I can do about it in the short run.

Problem 3: I'm an agnostic, not an atheist. That being said, I would notice that the Christian is using a circular system of proof, and not agree with them.