Dan Brown borrowed his premise from Holy Blood and Holy Grail, but that book was not only discredited by its authors (although their study of christian history was captivating) and an amazing book by Clive Prince called the Templar Revelation (which Brown raped) because of their reliance on the greatest hoa artist on Earth since DaVinci, a man named Pierre PLantard. I agree the movie will open people up to different ideas, but its about as wrong as Christianity itself. At least alternate views of history can be shared because Christianity suppressed and destroyed so much thought and experience from our human past, and this is why I hate it. But I love me a good fable.