the da vinci code is a story of a girl who's grandfather was the member of a secret community "the priory of sion" people who carry the secret of mary magdalene. these people passed on this secret from generations to generations like the genetic information. the story moves around this girl as dan brown reveals the "secret".
the members of the priory of sion say that jeasus christ who was a normal human being did marry a girl mary magdelene in his lifetime and they too had a child a girl child.but church who believs that christ was not a human bieng but the almighty who came to earth for the good of us and he never married.to prove his point church played dirty tricks they killed people who told the truth and destroyed every evidence which told the sad story of mary magdelene.
dan brown also commented indirectly on the community of christians the opus dei which believed that by sufferings and pains one can reach to god. members of this community wore a belt on there thigh made of sharpened edges for about two hours a day.
this book was quite in disputes. many scholars says that it was just a work of fiction but no one can say . maybe somewhere in this world we may find the successors of jeasus...