When Craig Harline set off on his two-year Mormon mission to Belgium in the 1970s, he had big dreams of doing miracles, converting the masses, and coming home a hero. What he found instead was a lot of rain and cold, one-sentence conversations with irritated people, and silly squabbles with fellow missionaries. From being kicked -- literally -- out of someone's home to getting into arguments about what God really wanted from Donny Osmond,...