Thank you for not understanding propaganda. This movie is advertized using such slogans as 'everything your father taught you about Christianity is wrong'. Brown also maintains his whacky theories are historically accurate and supported by thorough research. Just because the main story is 'fiction', it slanders real people and religion in the process. If you think a fictional movie can not be used as a powerful propagation tool, you are sorely mistaken.
No, I am secure enough in my own faith so as to not let a fictional movie or book rattle that faith. Clearly, others are not so secure and as such they argue the points you cite from ignorance, fear, greed, guilt, and envy.
There is nothing new here, so why get so worked up about it?
When I heard about the book and later the movie I said, "Well, God must've figured it was time for a large, new harvest of believers in Jesus Christ!"
Dan Brown can claim his book is based on fact from now until Doomsday. That doesn't mean the book is based on fact.