Re: idioglossia, I once read in a biography of L. Ron Hubbard - not one of the authorised ones, obviously - that as a child he became so obsessed with the word "exobiddle" that his mother eventually washed out his mouth with soap to teach him not to annoy everybody by talking total bollocks. Apparently she did not succeed.
Might I suggest the adoption of this hitherto meaningless word to refer to statements made by a religious spokesperson which don't actually mean anything? "God moves in mysterious ways His wonders to perform, so it's really all for the best that your baby died of cancer" - that sort of thing.
Also, it would REALLY piss off the Scientologists, and I don't see how they could sue.