I know that many people feel that Mormons are just "Christians who wear magical underwear." I don't know enough about their positions to arrive at an opinion yet.
But he DOES do his literary homework quite thoroughly....
In the mid-1980's he published a work called The God Makers, co-written with a former highest ranking "priesthood" member of the Mormon faith.
The historical/doctrinal expose' was eye-opening enough....
But the effects and implied stress of this works-based religious system were well documented - and cause for empathy, compassion and prayers.
It's an interesting read...
Just FYI....