Westerners love an existential crisis. Each decade since the First World War has raised up prophets of doom proclaiming the end of the Western world as we know it. But this time it's real. Weighed down by economic woes, the seemingly endless war on terror, and the declining power of religion as a unifying force, the West has been limping along. With the public sphere fraying and authoritarian politics rising, this deep-seated crisis is now urgent,...