Some who have left Islam have said that the way to get people out of that cult is to have them actually read the Quran.
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I had to read the Quran (both in sura order and chronological order) for a class on Religion in the Middle Ages...scariest book I ever read.
The best way to get the LDS out, is to get them to read the Bible without the LDS footnotes and chapter headings.
Heck; can you even do that with a BoM???
(It's worse online: LDS.ORG)