Turbans of the mind are disallowing and disavowing proper intellectual engagement with Islam. Aldous Huxley once defined an intellectual as someone who had found something in life more important than sex: a witty but inadequate definition, since it would make all impotent men and frigid women intellectuals. A better definition would be a freethinker, not in the narrow sense of someone who does not accept the dogmas of traditional religion, but in the wider sense of someone who has the will to find out, who exhibits rational doubt about prevailing intellectual fashions, and who is unafraid to apply critical thought...