Muriel Degauque, believed to be the first European Muslim woman to stage a suicide attack, started out life as a good Roman Catholic girl in this coal mining corner of Belgium known as the black country.

…her story supports fears among many law enforcement officials and academics that converts to Europe's fastest-growing religion could bring with them a disturbing new aspect in the war on terror: Caucasian women committed to one of the world's deadliest causes.

There’s absolutely...