In short, the director has it out for the Catholic Church and Christians alike. He make claims that cannot be substantiated with any facts, it's a blatant attempt to sway Christians away from their beliefs. For example, he said that Jesus was married to Mary Magdalene, yet he cannot back it up. The movie is a blasphemous lie against Jesus. He'll more than likely rot in hell for his portrayal!
It's not about the director it's about the book. Dan Brown stated in his book, "the Da Vinci Code" that aside from the fictional main characters all the assertions on Historical items, events, people etc are true and can be verified. Most of his stuff came from a book called "Holy Blood Holy Grail" by Michael Baigent,Richard Leigh and Henry Lincoln, which i have. It's basically about a cover up by the catholic church regarding the 2 issues:
1. Mary was not a hooker and mothered a child from Jesus.
2. Mary fled to France and thier offspring continued to procreate resulting in a "Royal bloodline"
This would invalidate the present religious establishment of christianity.
Now before we get too way out in space rattling our "Facts" sabers...
We are going to see a large amount of negative press on both sides of these issues. Both will sound convincing to their respective sides.
some facts aside of that:
Both sides have holes.
Both sides will have reasonable angles to back up some of their claims.
That's the funny thing about looking into the past. All evidence is subject to interpretation. WE have very little REAL facts with out being there.