I once observed to a Mormon friend that Gordon B. Hinckley, late president of the Mormon Church, publicly lied when it suited him. No, I didn’t simply up and assault my friend’s faith. That would be bad manners. He and I discussed religion often; this happened to come up in the course of one of our conversations. “Lied?” said my Mormon friend. “Name one instance.” Without having to think hard or research, I came up with three: 1. When Hinckley served as an assistant to his predecessor, Ezra Taft Benson, he repeatedly assured church members that Benson was actively engaged...