"It deliberately presents fiction as fact."
Fragment of a discussion from Comments:'Da Vinci Code' opens in theaters, sparks controversy
I was going to suggest that the bishop's remark about insulting Jesus and the Church was more revealing of their emotional response; but, on reflection, it is also quite striking that one would criticize a work of fiction for presenting fiction as fact. Perhaps the difficulty arises because this work of fiction, by drawing on plausible-sounding evidence, has a level of evidential support competitive with the mythology of most religions.