I have read that surveys generally show that 25-33% of Americans identify themselves as evangelical. Of course, not all evangelicals are intolerant nuts--I have a few people on my flist who would probably identify as evangelical but also support GLBT rights and religious tolerance--and there are intolerant nuts who would not identify as evangelical, but I think it's a pretty strong statement that at least a quarter to a third of Americans identify themselves with a religion that tends to preach intolerance and tends to lead efforts to dissolve the separation of church and state.
no subject
Those are scary numbers ...