@Vasska,
Why did some Muslims get in such an uproar about images of Muhammad in Denmark? Because fundamentalists cannot handle anything that threatens their narrowly conceived world view.
Christian fundamentalists just cannot handle the dissemination of information that calls into question their dearly held beliefs. This is true of most fundamentalists.
I didn't read the book, nor did I watch the film.
As for people taking the material as if the material was grounded in fact, there was a book in the 80's that was supposed to be a serious investigation of the notion of Jesus having a child, and that lineage going on to Europe, ect. Of course, the book was a joke.