I'm not to excited about Warren either, but I think what Warren is trying to get at when he calls fundamentalists an enemy of the 21st century is that he is referring to the hillbilly type mentality of Christians that exist out there in large numbers. People who go to church because that's the thing to do, people who believe certain things because that's what've they've been taught to believe without ever questioning whether it is the gospel truth or not. People who really don't think though things in life, they just live by there emotions and move with the crowd.
The phenomenon you describe exists among all religious cultures and groups, so your choosing to identify it by the term "hillbilly" is certainly unjustified and uncalled-for.