The book was talked about alot before the movie was even made. It was a best seller. Of course the main plot is fiction, but like how Chriton pulls in science and tech facts Brown pulled in historical facts and therories. I know it is not all true but I don't want people to mistake the fact that parts are. Like mary mag does have a gospel. And all that symbology stuff is true. I was actually more interested in the codes and symbols than I was the christian stuff, i think this is becuase I have a slightly negative view of the christian church and I am a geek.