Also, when it comes to debunking conspiracy theories, who makes the skeptic or debunker the automatic authority on the subject?
I find that relying solely on skeptic/debunker's final say regarding anything that has to do with history or "conspiracy theories" is not a good thing to do because a lot of times, these debunkers/skeptics are using the "safe and proven fact-base" to debunk such alternative knowledge.
I have done some studying on the things Dan Brown presents in his book MANY years before the book even came out (since about 1994). Truth be told, yes, some of the things he mentions in his book are fiction (much regarding the Priory is misconstrued purposely I believe) but a lot of it is not. Do your research on the Pagan and Ancient Egyptian religions and you will understand. The Council of Nicea was a real and documented event.
I find that many people who try to debunk this book are hard-core christians that will not even attempt to have an open mind. (This is in no way an attempt to Bash the christian religion or any of its followers.)