I'd love you to back that up, Tom
I don't believe any of the secret society stuff, but the things that were said about the Church demonising pagan religions, the things said about Jesus's life and the "Holy Grail" all seem pretty plausable.
I accept that the Church would do anything to vilify women and the reason that they're so threatened by the idea of Jesus livig a mortal life and having a wife and family would be because it [somehow] weakens their claim that Jesus was nothing less than Divine, especially considering his life as a Jewish man 2'000 years ago.
So yeah, the stories of the Priory of Sion and the Opus Dei were pretty entertaining fiction, but the story about the Sangreal and the Church's corruption of Pagan symbology and Pagan holy ground, I do believe.
NOWHERE in the book does it say that God isn't real - all it says is that the Church isn't the sole conduit to the divine, and THAT is what the Church fears so much - the threat of becoming obsolete because their stranglehold on civilisation is something they depend on too much.