Yes..I do. So what?
I still don't understand why such an issue is being made about the book being fiction. Everyone knows it is fiction.
Most of you believe that the Bible is fiction, for heavens sake! So what?
The reason the subject has been posted here is because the book is centered around religion and atheism and science. These are subjects that we discuss here everyday. That's all!
Probably most people do realise that it is fiction, but like you, many of them seem to think that the matters that Dan Brown raises are based on genuine historical and religious research. It is all very well stimulating the general public to take an interest in such matters by means of a piece of page-turning fiction, but when the intellectual basis for such tales is so shoddy, misleading, ill-informed and downright spurious, any potential didactic spin-off is likely to be irredeemably tainted from the start.
It is no coincidence that the genuine (and agnostic) biblical scholar Bart D. Ehrman was so concerned over this aspect of Dan Brown's work that he felt the need to write
Truth and Fiction in the Da Vinci Code.
https://archive.org/details/BartEhrman-TruthAndFictionInTheDaVinciCodeFair enough, if you want to recommend a few thrillers to while away the time on holiday (or during our British winter), then I'd welcome the suggestions. But you actually seem to think Dan Brown is a rigorous scholar of history, religion and science as well.