I think Dan Brown has mixed emotions on Freemasonry, like a love hate relationship. I think he knows that Freemasonry is not perfect and its members never promote that we are a Order of all knowing, perfect moral beings. We are still human beings striving for answers and seeking to improve on morality, virtue, and values. Dan Brown is defending our position to some degree but also makes it interesting by adding fictionous elements to the stories to make it a bit more dramatic for people that enjoy those elements in stories.He should become a Freemason but might get denied because he could pose a threat to the Order (see Infiltration).
I believe he wants the general public to know that not everything is "seeing is believing" (see Angels and Demons). I believe he attacks self-righteousness in general and not in a blame game way, no specific group or person, just the principle of self-righteousness. That is my impression of his style.
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Amethyst Lodge No. 2, Orient of Tulsa, Oklahoma and Isis Lodge No. 3, Orient of Oklahoma City, Oklahoma...A.F.H.R.