People who see maybe two or three new Broadway shows a year — which is to say normal people, not necessarily critics who get to see everything — will like “Leap of Faith” for its playful energy, and because the formula will not be so well-worn for them. They’ll admire its tunes by master songwriter Alan Menken (you always leave the theater humming his music), and its attractive and talented cast led by the superb Raúl Esparza as the preacher, Jonas Nightingale...“Leap of Faith” is about a phony who employs the cheap trick. If the show offers any real revelation, it’s that the playwriting does, too.