"Although when Christianity appeared the total population of the planet was only a fraction of that of the twentieth century, most of the earth's surface was quite outside the Mediterranean world, Persia, India, and China."

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The driving force behind today's terrorist threat is Islamist fundamentalism. The struggle we are engaged in is, at root, ideological. During the last century a strain of Islamist thinking has developed which, like other totalitarianisms, such as Nazism and Communism, offers its followers a form of redemption through violence.

— David Cameron