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'A Muslim has no nationality except his belief," the intellectual godfather of the Islamists, Egyptian Sayyid Qutb, wrote decades ago. Qutb's "children" are everywhere now; they carry the nationalities of foreign lands and plot against them. The Pakistani born Faisal Shahzad is a devotee of Sayyid Qutb's doctrine, and Maj. Nidal Malik Hasan, the Fort Hood shooter, was another.

Qutb was executed by the secular dictatorship of Gamal Abdel Nasser in 1966. But his thoughts and legacy endure. Globalization, the shaking up of continents, the ease of travel, and the doors for immigration flung wide open by Western liberal societies have given Qutb's worldview greater power and relevance. What can we make of a young man like Shahzad working for Elizabeth Arden, receiving that...