Visit the Salt Lake City Cemetery, and you’ll see headstone after headstone engraved with the Salt Lake temple, with an occasional depiction of some other LDS temple here and there. Unlike crosses adorning Catholic headstones or the Star of David on Jewish headstones, the LDS temple is not a symbol, a refined visual token of belief or belonging: instead, it’s a literal representation—announcing where the people in these graves were married. It is impossible to understand the Church of Jesus Christ of Latter-day Saints without understanding the role of marriage in the religion. Marriage is not merely a good idea...