Fundamentalism and Evangelicalism are not "grass roots" objects, both in the US and in the Middle East they are funded by state and elite actors as a means of exerting control. Without billionaire backed money, creationists would be smelly people in cheap suits talking in polyester Motel 6 conference rooms about the "Darwin conspiracy". Without Saudi backing, Wahabism would be confused with people who like too much green stuff on their sushi.
It's a long and interesting piece at the Blogging of the President.