If Dan Brown had the guts to do the same kind of film about Islam, there would be a price on his head...
As Rushdi found, write a book where Islam is the bad guy and all you get is a Nobel Prize, an price on your head, and a quick trip to the Barnes and Noble dollar bin. As Brown found, write a book where the Vatican is the bad guy and you get millions in royalties, a fat film contract, and millions more in advances for the sequel. Which would you choose?