As the American media has copiously noted, the next year or so promises to be a breakout moment in the mainstreaming of the Mormon faith. There are already two Mormon contenders for the G.O.P. presidential nomination: former Massachusetts governor Mitt Romney and former Utah governor and diplomat Jon Huntsman. There’s the Tony-winning Broadway comedy The Book of Mormon, which has proved a runaway critical and commercial success. (Serving as recognizable fodder for parody certainly marks a cultural coming-of-age, and for the most part, Mormon leaders have taken the send-up in confident stride.) There are high-profile offerings from Mormon sources…