1400 YEARS LATER, THEY'RE STILL FIGHTING

   The Sunni-Shia conflict defines the political structure of the Middle East, from the international rivalry between Iran and Saudi Arabia to the internal politics of Muslim nations. And yet, Western politicians, eager to portray Islam as a “religion of peace,” speak of Muslims as homogenous.

  In truth, there are Shiite Muslims who do not think Sunnis count as Muslim at all, and vice versa. Adherents of the more extreme sects within the Sunni and Shia schools view moderate followers of the same basic tradition as apostates.