What do you consider the biggest threat to Western Civ?
By "Western Civilization", I mean the culture, customs, and practices spanning religion, politics, philosophy, business, and other areas that have shaped and distinguished the way the West has lived through history. While there are obviously differences between individual countries and cultural groups within the West, there are common denominators which pierce through them and separate the West from Africa, Asia, and other areas of the world.
Some candidates for threats include Islamic expansion, moral relativism, secularism, growing Chinese strength, and Western population decline.
What's your view?