Less than a year after I moved to the United States in 2006, I was asked to speak at the University of Pittsburgh. Among those who objected to my appearance was a local imam, Fouad El Bayly, of the Johnstown Islamic Center. Mr. Bayly was born in Egypt but has lived in the U.S. since 1976. In his own words, I had “been identified as one who has defamed the faith.” As he explained at the time: “If you come into the faith, you must abide by the laws, and when you decide to defame it deliberately, the sentence is death.”

After...