World Christianity is a complex animal. So, of course, is world Judaism. Liberal formations matter less and less whereas evangelical Catholicism and evangelical Protestantism and even evangelical Judaism are surging. In order to understand why that is, it is essential to grasp something of the social and spiritual dynamics of events such as World Youth Day, which took place in Madrid this summer and counted 2 million participants. A Catholic event of the first order, it is a “We are the World” event. And who can say, with more authority than the Catholic Church, that “we are the world”? How does World Youth day “feel” in western Europe, a secularized region in the throes of re-enchantment?