On May 22, an Islamic suicide bomber detonated himself outside a pop concert in Manchester, England, killing and wounding dozens, many of them young children.The terrorist was a 22-year-old named Salman Abedi. A few days after the attack, I was reading an article about the mosque he attended—the Didsbury Mosque. “That’s funny,” I thought looking at the accompanying photo, “that doesn’t look like a mosque, it looks like a church.”Sure enough, as I discovered, the Didsbury Mosque was once the Albert Park Methodist Chapel. It had been bought by the local Syrian Muslim community and transformed into a Muslim...