I would agree with you if the book or film were not intended as fiction. While Dan Brown used fiction, his specific intention was to revise history, and therefore I'd consider the Da Vinci Code to be worse. Even though the film is theologically questionable, if one chooses to take it literally, the Last Temptation does have good artistic quality.
I have always found this an interesting approach to the concept. During the brouhaha over the DaVinci Code I was watching Scarborough Country and he said something along these lines, that he enjoyed the book as a piece of fiction, but when the author or others tried to place it in non-fiction terms it upset him. I thought that was a very flawed, and impossible for a Christian, approach. Let me explain.
Let's say your mother's name is Christine Davidson, and she was a nurse in the small town of Mexia, Texas during the sixties when you were growing up. She was a good Christian woman who devoted herself to her family and worked hard to provide for everyone in it. You had two brothers, Phil and Peter, and your dad was a mechanic named Bob. Now, I write a book, call it fiction, and make the main character Christine Davidson from Mexia, Texas, who is a nurse, is married to Bob the mechanic and has three sons, Matthew, Phil and Peter. All the particulars are your family and mother, and I use your mailing address for the house and everything. I sprinkle in details about your family life, broken leg, birthday parties, etc. I only change one thing, I make your mom a drug addict turned prostitute who is also stealing money from her work and her husband. Now, if I insist it is fiction, would you buy the book and enjoy it, saying that it was okay because I am not trying to rewrite history? Somehow, I doubt it.
Let us be honest with ourselves here. Jesus Christ is not some historical concept. He is not the Titanic or the Alamo. He is our Lord God and Saviour. We are called by the Spirit to love Him, and to love nobody more. As he said if you love your mother more than him you are unworthy of him. With that in mind, ask yourself, if you would read the Last Temptation or
the DaVinci Code, which presents a "fictional" Jesus who is an infinite insult to the Divine Jesus of reality, but would not buy and read a book presenting the fictional insult to your own mother, who do you love more? Ultimately, for us believers, it has nothing to do with rewriting history, it has to do with blaspheming the Lord.
Now, I will admit that I am sure that there are people who will disagree with me. That is fine, but I would suggest that you look at the above scenario, and unless you would be willing to defend and read a book defaming your mother, or brothers or father or so on, then you are likely taking a bad perspective on the issue.