It was the winter league's opening day in the baseball-mad Dominican Republic. Yet 9,000 sweltering Dominicans chose instead to crowd into Santo Domingo's new Sports Palace for a different event: the windup of the "Festival of the Family," a series of revival meetings. As the high-spirited, hand-clapping throng fell silent, a handsome, wavy-haired spellbinder named Luis Palau took the microphones and thundered about an impending "climax of history." After more than an hour onstage, Palau appealed for commitments to Jesus Christ—and converts streamed onto the playing floor.
All told, 105,000 Dominicans attended the twelve...