Maybe if people educate themselves on what was said by Dan Brown himself, maybe there won't be a need for riots etc...stright from the horse's mouth:
Dan Brown
Excerpts:
HOW MUCH OF THIS NOVEL IS TRUE?
The Da Vinci Code is a novel and therefore a work of fiction. While the book's characters and their actions are obviously not real, the artwork, architecture, documents, and secret rituals depicted in this novel all exist (for example, Leonardo Da Vinci's paintings, the Gnostic Gospels, Hieros Gamos, etc.).
IS THIS BOOK ANTI-CHRISTIAN?
No. This book is not anti-anything. It's a novel. I wrote this story in an effort to explore certain aspects of Christian history that interest me. The vast majority of devout Christians understand this fact and consider The Da Vinci Code an entertaining story that promotes spiritual discussion and debate.
ARE YOU A CHRISTIAN?
Yes.