Forgot to add, if you're interested in exploring non-Christian faiths, "The Complete Idiot's Guide to... " series are fabulous. I have them on Islam, Judaism, and Christianity. When I had doubts on Christianity, I went through this whole spiritual search. For awhile, I would consider myself only a Monotheist (belief in one God)... but didn't get much more specific. Eventually, it came down to between Islam and Judaism--two remarkably similar faiths at their core. Reading the Qur'an with the rights it gave women back in the 7th century (really...this is not a typo) versus the Bible, as well as Muslims view of Jesus as a Prophet...swung me towards Islam.
Anyway, check out BeliefNet's Belief-o-Matic. It may help you synthesize your beliefs into a few different faiths or sects of Christianity to explore:http://www.beliefnet.com/story/76/story_7665_1.html
As for "The Case for Christ"... I tried to read it, but couldn't get into it. I just didn't like his style. I'm sure your local library has a copy though...and some Christians give out copies as an evangelism tool (There's a special edition for that purpose).
One book that I really enjoyed was "When Jesus Became God" by Richard Rubenstein. As somebody who struggles with the whole Jesus as God thing (Jesus worshiped God-the-Father and stressed Monotheism) it helped me solidify some points that I always wondered about. The whole Trinity doctrine wasn't finalized until the 4th century.
May God guide you on your search.