Mingled regularly in the novel's fast paced action, Dan Brown has planted a subversive array of discussions, memories, deliberations and arguments against historic Christianity. The novel's experts offer a web of plausible sounding arguments which will raise doubts and questions in the minds of all but the most well-informed students of Jesus, the Bible and History.

The book begins with these assertions:

FACT:

The Priory of Sion-a European secret society founded in 1099-is a real organization. In 1975 Paris's Bibliotheque Nationale discovered parchments known as Les Dossiers Secrets, identifying numerous members of the Priory of Sion, including Sir Isaac Newton, Botticelli, Victor Hugo, and Leonardo da Vinci.

The Vatican prelature known as Opus Dei is a deeply devout Catholic sect that has been the topic of recent controversy due to reports of brainwashing, coercion, and a dangerous practice known as "corporal mortification." Opus Dei has just completed construction of a $47 million World Headquarters at 243 Lexington Avenue in New York City.

All descriptions of artwork, architecture, documents, and secret rituals in this novel are accurate.

Brown has the plot's "deluded villain" Catholic Bishop Aringarosa express a false view that there is tension between faith and science:

Aringarosa had never been comfortable with the Vatican's historical need to dabble in science. What was the rationale for fusing science and faith? Unbiased science could not possibly be performed by a man who possessed faith in God. Nor did faith have any need for physical confirmation of its beliefs.

Holy Grail "expert," Sir. Leigh Teabing, advances his views about the corrupted canon of the Bible and a merely human, married Jesus:

"More than eighty gospels were considered for the New Testament, and yet only a relative few were chosen for inclusion-Matthew, Mark, Luke, and John among them. "Who chose which gospels to include?" Sophie asked. "Aha!" Teabing burst in with enthusiasm. "The fundamental irony of Christianity! The Bible, as we know it today, was collated by the pagan Roman emperor Constantine the Great."

...

"My dear," Teabing declared, "until that moment in history, Jesus was viewed by His followers as a mortal prophet... a great and powerful man, but a man nonetheless. A mortal."

"Not the Son of God?"

"Right," Teabing said. "Jesus' establishment as 'the Son of God' was officially proposed and voted on by the Council of Nicaea."

"Hold on. You're saying Jesus' divinity was the result of a vote?"

"A relatively close vote at that," Teabing added.

"It was all about power," Teabing continued. "Christ as Messiah was critical to the functioning of Church and state. Many scholars claim that the early Church literally stole Jesus from His original followers, hijacking His human message, shrouding it in an impenetrable cloak of divinity, and using it to expand their own power. I've written several books on the topic."

...

"As I mentioned," Teabing clarified, "the early Church needed to convince the world that the mortal prophet Jesus was a divine being. Therefore, any gospels that described earthly aspects of Jesus' life had to be omitted from the Bible. Unfortunately for the early editors, one particularly troubling earthly theme kept recurring in the gospels. Mary Magdalene." He paused. "More specifically, her marriage to Jesus Christ."

Our novel's hero and historian/symbologist Robert Langdon represents faith as inherently dishonest:

"But you told me the New Testament is based on fabrications."

Langdon smiled. "Sophie, every faith in the world is based on fabrication. That is the definition of faith-acceptance of that which we imagine to be true, that which we cannot prove. Every religion describes God through metaphor, allegory, and exaggeration, from the early Egyptians through modern Sunday school. Metaphors are a way to help our minds process the unprocessible. The problems arise when we begin to believe literally in our own metaphors."