You would be excused for thinking that the Wahabbi religious establishment of Saudi Arabia and the religion guarantees of our First Amendment have no more in common than fire and water. But I think this oddest of odd couples helps to explain two recent events involving American Muslims and the rest of us -- instances of so-called “home-grown†Islamist terrorism, such as the Fort Hood murders, and the resentment being reported among American Muslims at FBI and other law-enforcement-agency activities at U.S. mosques. To be sure, the religious values the First Amendment protects -- freedom of worship, the nonestablishment of...