I am not religious although I was brought up Protestant. I went in to the movie keeping an open mind as much as possible. I wanted to see if it 'made me believe'. I was also curious how someone who knows nothing of Christianity would view the movie.
From the non-Christian point of view, you have a guy, who believes that he is in some way divinity. In most cultures, that right there is a red flag. Numerous times, he shows utter disrespect for the Romans as well as the Jews. Rather than taking a diplomatic approach to things, he is very confrontational. I found it very hard to be sympathetic when it is obvious he is bringing most of the things that happen down on himself and is doing it willingly.
Again, I don't mean to insult anyone by saying these things, this is just the impression I got watching it. I highly doubt anyone from a non-Christian culture, who watches this movie is going to get much out of it besides Christians like to watch their 'God' being tortured to death.
And from the Christian point of view, this is Christ, the very image of God incarnate on earth. He is the Creator, Lord and future Judge of these very people who want to kill Him for claiming to be the Messiah.
The fact that He even subjected Himself to them, and prayed that they be forgiven shows a grace and humility that is astounding considering who He really is.