In an interesting article which argues that Bush is more a "positive thinking", New Agey Christian rather than a fundamentalist, Jeff Sharlet has the following to say about (Protestant) Christian fundamentalism:

Christian fundamentalism, meanwhile, is the child of the Enlightenment, a functionalist view of faith that's metaphorically "scientific." It's scripture as read by a cranky engineer who just wants to know how God works. The Bible, for a fundamentalist, isn't powerful literature demanding our ever-changing discernment; it's an instruction manual. And fundamentalists think that's a good thing.

Jeff Sharlet. The Revealer, Our Magical Persident, October 22, 2004

Of course he then goes on to quote Dostoevsky's The Possessed and afterwards calls D. a "proto-fundy". Eh, I still like the "cranky engineer" line.