rationalskepticism.org

The problem with that is that from the point of view of the delusion, he's not right, so it makes no sense within his philosophy to ask "outside". And that's starting from a presuppositionalist viewpoint, if one admits the possibility of error as you suggested he should and starts from a neutral standpoint, then things only get worse.

All of this is also perhaps being uncharitable to James and assuming that he has deluded himself into believing he's the second coming of Christ, and I'm really not sure he has done anything quite so silly here.