Cover Story | At 5:30 p.m., the church begins to rock. A hundred teenagers in the choir loft jump to their feet, clapping and dancing as they sing. The vast congregation responds in kind, and soon the cavernous auditorium is literally shaking. Maybe there's too much shaking. After 15 minutes a man takes the pulpit with an important announcement: "We ask the people in the balcony not to jump or bounce. It wasn't designed for that. You can come downstairs here if you want to worship."