Suppose for a moment that the birth in Bethlehem that Christians celebrate this week never happened --that it is, as the secularists would have it, mere mumbo jumbo, superstition, a myth. In other words, consider it not as an event but as a narrative. You want to launch a big new global movement from scratch. So what do you use? The birth of a child. If Christianity is just a myth, then it is, so to speak, an immaculately conceived one. On the one hand, what could be more powerless than a newborn babe? On the other, without a newborn...