To watch the movie without the subtitles would mean you would have to focus that much more on what's going on in front of you. Jesus' story is pretty well known and seeing how Gibson is being religious about it, the story is somewhat familiar to most of the audience. Since there won't be little words on the bottom of the screen, people will focus more on the visuals and hopefully be more moved by them.
And, yes, for realism's sake is a part of it. Understanding is not necessarily important, it's the feel you get from the language. It's not the same necessarily, but I know many people who would watch a foreign flick in it's native language rather than watch a badly dubbed version. Unfamiliar language forces you to work and focus rather than get comfortable.
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