IT SEEMED historic. Muslim scholars, 170 in number and representing nine schools of legal thought (including four main Sunni ones and two Shia), gathered in Amman and declared that, whatever their differences, they accepted the others’ authority over their respective flocks. Implicitly, at least, they were renouncing the idea that their counterparts were heretics. Some called that meeting in Jordan in 2005 the biggest convergence since 969, when a Shia dynasty took over Egypt.

Many of the globe-trotting greybeards who met there, and at a similar gathering in Qatar in 2007, remain actively and optimistically engaged. But seen from the outside, feuds between Sunnis, who make up roughly 80% of the world’s Muslims, and the Shia minority (most of the rest), remain savage and are, in some ways, worsening.

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