Yes, the Da Vinci Code is fiction, and if it had been left as a work of fiction by the author, the whole matter would be unimportant. Several people in my family read this book as fiction, and since it has been out for a few years I have paid no attention to it.
THEN, I discovered that one of my sisters, who is not an expert in history, had seen the author explaining the TRUTH of this book on a talk show. She bought into the whole thing, and as a result now believes that the Church lied about Christ, and has lost her faith. I have tried explaining the truth to her, but I am simply her sister and not a published author and "historian", you see.
So, I take this book very seriously because the author has made repeated appearances claiming that even though the publisher said the book was fiction, it really is the truth. Look at the listing of the places on that Dav Vinci Code tour. People aren't going on that tour because of a work of fiction. They think they are going to see the places where the stuff in the book actually happened.
I am not advocating protests against the book, nor am I advocating censorship. What I DO think is that the Church, in all its forms (Catholic, Orthodox, and Protestant) step forward and debunk the many inaccuracies and lies in this book. The author needs to be engaged in debate by church historians and experts in archaeology. Oprah needs to have on people who explain the truth about this book.
To those who don't have historical knowledge and do not have a strong faith, this book is very dangerous.
I hope you will seriously consider what I have said. Thank you for taking the time to read my post.