From a conceptual perspective, the DaVinci code is in the ballpark. If you really get into the Hebrew and Greek in the Bible, you'll find a lot of the same information there regarding mystery religions and the whore of Babylon.
If you like the DaVinci code, I also recommend you read a series of books called The Alberto Series. It is the autobiography of a former Jesuit Priest, Dr. Alberto Rivera, who exposes the mafia- and occult -like atmoshpere of the Catholic Church. The books are written in comic book form so it's easier to understand and visualize what Dr. Alberto Rivera was saying.
You can find the books at
www.chick.com.