While that case is unfamiliar to me, I only comment in a more general level. IMO what you described a blurry line is that only because of popularity. If a Muslim were to tell the American public about Allah commanding him to do something weird, he'd be considered downright crazy but when it's xian God telling to do stuff, it is at least somewhat accepted.
You could of course make a bold claim and say that everything religious is crazy but fortunately most is benign.
We are talking about similar issue as in the moderates vs. fundamentalists - the benign moderates claim that the fundies do not represent their faith yet they are unable to condemn them because in doing so they'd be condemning themselves too.
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