The FBI is teaching its counterterrorism agents that “main stream” [sic] American Muslims are likely to be terrorist sympathizers; that the Prophet Mohammed was a “cult leader”; and that the Islamic practice of giving charity is no more than a “funding mechanism for combat.”

At the Bureau’s training ground in Quantico, Virginia, agents are shown a chart contending that the more “devout” a Muslim, the more likely he is to be “violent.” Those destructive tendencies cannot be reversed, an FBI instructional presentation adds: “Any war against non-believers is justified” under Muslim law; a “moderat...