If a writer were to make the ultimate satiric remark about Islam's increasing presence in America, he would say something like, "And soon they'll be having the 'call to prayer' in Harvard Square." Except, for those who have been paying attention, the line is neither ironic nor humorous: The call to prayer of a Muslim muezzin or priest was broadcast in Harvard Yard at the Widener Library in Cambridge several times in February, as well as on earlier occasions. As well, the undergraduate college has this winter restricted one of the three largest gyms on its main campus to "women...