THE BEIGE STUCCO HOUSE IN MIAMI'S western suburbs looks too tidy and typical to hint at what transpires inside. But the noises give it away: chanting, bleating, squawking, cooing. At the back of the house, in a white-tiled, surgically clean room, sits an old woman in a white dress. She will remain there for an entire week, eating and resting and praying. The remainder of her initiation into the priesthood of Santeria -- literally, "saint worship" -- will take an entire year, during which she must wear only white, remain celibate and eat only prescribed foods.
She is joined for her...