What have you learned since the Sept. 11 attacks five years ago? The mass murder of 2,996 innocent people on American soil forced open my eyes to the Islamic holy war against the West, freedom and modernity. The battle has raged not for years or decades, but for centuries — well before the Crusades began. The indelible sight of workers plunging from the Twin Towers — head first, feet first, solo, hand-in-hand — roused me from slumber. The photos of children incinerated on United Airlines Flight 175 and American Airlines Flight 77 compelled me to start paying attention to the...