The growing danger of the Sunni-Shiite rivalry

"See how the Christians love each other!" This used to be the secular response to the fratricide between Catholics and Protestants, let alone the schisms within the Catholic Church and the vicious quarrels between different schools of Calvinism.

Within Islam, these lines of division are many times more acute. Ahmadi Muslims are considered impossibly heretical by most other followers of the Prophet, and Ismaili Muslims are looked upon askance in many quarters as well, but the rivalry between Sunnis and Shiites (which also conceals numerous poisonous rifts between different interpretations and leaderships in both camps) has become one of the most toxic phenomena in the world today. On Web sites that offer advice to the devout, Sunnis and Shiites ask their imams and ayatollahs whether it is permitted to take the life of a member of the other sect.