Exactly!
I have read a couple of books now that deride and debunk Mr Brown’s book (mainly through quoting scripture; if that was ever a valid argument, especially when the honesty of that scripture is one of the main facts being questioned..)
The book is a NOVEL. A piece of fiction. Anything within its pages [other than the legally required information] is subject to fabrication: including any fact ascribed to the world the book’s narrative operates within.
If you do any research on this subject it falls apart very quickly. The book is a good read, a catalyst for thought and study, but that’s all. Let’s face it Angels & Demons is the far more plausible story out of the two.
If Mr Brown had published these conclusions as a piece of academic study then things would be far different.
As it is I think the main reason the reaction has been so vehement, is those of faith reacted blindly to concepts of the story without taking in fully the book’s ‘novel’ status, and misreading the book as a direct attack on the church. All in all, it does seem quite similar to the problems Salmon Rushdie got into over his book. (Another book that had its sales boosted by the religion it was based around taking it way too seriously).