During the papal interregnum, divided Catholics await the new Holy Father to guide them in their third millennium, in which clergy in Roman-era headdresses send news releases via e-mail. Can conservatives save the church by sticking to 20 decades of received tradition? Or will liberals energize an embattled global parish only by ending priestly celibacy or seeing condoms as a tool in stopping AIDS? Yet the new pontiff, both his personality and ideas, will affect even those of us who are not Catholics. The pope is not a CEO who serves at the pleasure of his board. Nor like a...