That needs little exposition, but let me point out again that Brown claims this organization is/was real (not at all), that his descriptions of the art is accurate (not at all), and the etymology of the very basis of the book is not only suspect but completely untenable. while he doesn't state specifically that he believes this particularly theory was real, the whole purpose of trying to pull any of it off as real is to lend credence to the quest, which, in my opinion, is his worst sin.
another quote discussing the Last Supper painting that supposedly has Mary in it:
To this one could add that most depictions of the Last Supper, especially before the 13th century, are of the scene from John 18--they rarely show a Grail-like chalice or the moment of the institution of the Eucharist; rather, they depict the accusation of Judas, and they
emphasize the dishes on the table and especially the one shared by Jesus and Judas. Since Jesus was supposed to have had 12 named male apostles, one of whom is the boyish John, and Leonardo depicts 12 men one of whom is boyish, it is pretty odd to suggest that he "bumped" poor John out of the picture to replace him with Mary. The only tenable theory is that EVERY depiction of the Last Supper ever painted shows Mary Magdalene disguised as John (I have seen this argued on the web) and that sort of makes the theory less secret and less exclusive to Leonardo.
More detail for why this was the only tenable theory is given in the post. Note that all of these can be found on the
Arthurnet archives. They were posted today.
It should also be noted that even these scholars make the joke about pigeonholing McKellen to one role (one of them calls him Magneto, in fact). This is because they have a sense of humor.
Nearly all of the detail quoted there can be referenced more completely at
www.smu.edu/arthuriana/lacy.pdf(you'll note that this is a published paper by a medieval scholar at a university).
I want to close with a Roger Ebert quote:
Dan Brown's novel is utterly preposterous; Ron Howard's movie is preposterously entertaining. Both contain accusations against the Catholic Church and its order of Opus Dei that would be scandalous if anyone of sound mind could possibly entertain them. I know there are people who believe Brown's fantasies about the Holy Grail, the descendants of Jesus, the Knights Templar, Opus Dei and the true story of Mary Magdalene. This has the advantage of distracting them from the theory that the Pentagon was not hit by an airplane.
Which adequately sums my opinion on those who think any of the "history" in this book was real.