This classic article began the whole distinction between Neocon versus Theocon. I highly recommend this article for a good, but not perfect history or description of this debate. It's a beginning point. WordSpy references this article as the first time "Theocon" was used in print.
The book End of Democracy also dives into this topic on a couple of different occasions, specifically the chapter entitled "Neocons vs. Theocons?" Refer to the comments on this post.