On a Sunday morning at Beth Israel Worship Center in Wayne, N.J., a bearded pastor named Jonathan Cahn stood on an elevated platform, gazing over a full house. Stage lights shifted from blue to white as the backing band played a drifting melody. Two men hoisted curled rams’ horns and let out long blasts. Sitting at the end of a sleepy drive an hour from Manhattan, Beth Israel may look like any common suburban church. But the center has a highly unusual draw. Every weekend, some 1,000 congregants gather for the idiosyncratic teachings of the church’s celebrity pastor, an entrepreneurial...