That's true, but good fiction is always surrounded by and based on fact, and Brown is renowned for the exhaustive research behind his novels.
I'm not saying that everything he writes is necessarily true, but given the political state of the world at present, one can be forgiven for wondering.
There are all sorts of theories about Mormons, Masons, Knights Templar and Illuminati, and most of it is fairly obviously malicious bigotry as Joe said earlier, but this should not prevent us from asking questions about the true reasons our national leaders do what they do. Especially when what they do is otherwise so mystifying.