Personally, I think this one is more relevant. The biggest problem with the argument from visions and miracles, barring some much more complicated discussions of neurology than are really necessary, is that it proves too much, namely multiple contradictory religions.
It's a very interesting post. You're right that we can't accept all visions, because they will contradict each other, but in fact I think that many don't. It's entirely plausible in my mind that God really did appear to Mohammed as well as Joseph Smith, for instance, and they don't have to invalidate each other. But of course if you take every single claim that's ever been made, it becomes ridiculous.
Does it prove too much, then, to say that some visions are real and some are mental glitches? I'm not suggesting any way of actually telling the difference.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.