I want to see the film, purely out of curiosity, because I read the book and I want to see how much of the content they decide to bring out in the movie.
Imo - this is a seriously lame reason, lumen.
The whole speech that Teabing gives about Mary Magdalene is really, really dry and boring in terms of narrative/action content, so I'll be curious to see how much of it they cut and/or alter in the movie.
This is perhaps just adding to the lameness.
Needless to say, as someone involved in apologetics, I'm going to see the film, if only to be "out in front" of the reviews and such.
This might suffice, but I doubt it - as you have already read the book, and can easily access other materials to help you achieve your goal without viewing what you know is blasphemous trash. In the end, though, only you can decide for yourself.
No, your previous knowledge that it is blasphemous trash does not make it "safer" or permissible, as one could not just read the books of the Index, knowing beforehand that they are stuffed - there has to be an objectively serious reason (some kind of obligation, really) for exposing oneself to such garbage.