While I don't discount the threat of Muslim extremism, it might be instructive to review our history, from the Pilgrims on, and our treatment of the Godless heathens we found here. Then there is the matter of slavery, and the Apostle Paul's seeming endorsement. I do believe that American slaveholders, in the South and elsewhere, constituted quite a large group of Christians committing terror in God's name, and not so long ago. With the follow-on of Jim Crow terrorism until quite recently. One can make the case that this was economic terrorism that actually perverted religious principles for its own ends. But it's often difficult to make the distinction.

Dylan nailed it in "With God On Our Side".