Roman Catholicism stands at a crossroads, a classic ''best of times, worst of times'' moment. On the one hand, the Catholic Church remains by far the largest branch of the worldwide Christian family, and is growing at a remarkable clip. Yet the Church has also been rocked by a series of scandals related to the sexual abuse of minors by clergy, and, even more devastating, the cover-up by the Church hierarchy. The decade-long crisis has taken a massive financial toll, but the blow to both the internal morale and the external moral standing of the Church has been even steeper. Today, the Church...