The controversy:

According to Dan brown, the Holy Grail is not a chalice or a cup rather it is the bloodline.

The bloodline he asserts was created when the marital union of Jesus Christ and Mary Magdalene took place. In simple vanilla Mary Magdalene was married to Jesus Christ.

Jesus designated Mary Magdalene as His successor, that His message was about the celebration of the "sacred feminine," that Jesus and Mary Magdalene were married and had children and that the Holy Grail of legend and lore is really Mary Magdalene, the "sacred feminine," the vessel who carried Jesus' children.

Now this is really a very controversial statement .The church’s rep is at stake now. All over the years the church propagated the opposite of it. In the bible Mary Magdalene has been depicted as the prostitute or a woman under demonic possessions.

The gravity of the statement has the potential to shake the very foundations of the church.

Apart from the controversy regarding the marital status of Jesus Christ, the book also exposes itself to many historical inaccuracies that are dominant according to many historians. Dominant in the way that the author uses the so-called-inaccurate historical facts as the base and support for the theme of the novel.