It’s 9 p.m. on Oct. 13, a Monday, on the University of Pittsburgh’s campus in Pittsburgh, Pennsylvania. There are two NFL games on TV and fall midterms are this week — but roughly 300 students are packed into a room in the student union building, clapping or raising their hands in worship. “No treasure of this life could ever satisfy,” the students sing, some standing, others kneeling in the back. “God, you are my everything.” Moments later, the group’s founder, 34-year-old Jo...