First of all, I am not religious, at all, but it didn't stop The Passion of The Christ from having an extremely powerful effect on me. It is very moving, and can teach you a lot about yourself...and other people, who unfortunately "know not what they do" if you know what I mean. For me, The Passion of The Christ's main messages that came across on screen were:
1- people say/do bad things, and worst, and either aren't able to comprehend the affect that their actions have on others, or just ignore it because they do know, but still aren't able to stop themselves from inflicting pain onto others.
2- when someone says/does something bad to you, you should accept that some people just can't help themselves, and you should try hard to treat everyone as well as you can, regardless of how they treat you.
I also feel compelled to point out that the atrocities against Jesus in The Pssion of The Christ are in fact instigated by the religious parties (make of that what you want). Also, I understand why the violence in the film does not sit well with some people, but I believe that it is neccesary to show the true strength of Jesus' character. Make no mistake, the violence is awful, but reality is not sensored, so to sensor the violence in The Passion of The Christ is to 'close your eyes', and only serves to water down the viewing experience and weaken Mel Gibson's intended message. So watch the original theatrical version instead of the new cut (unless you are extremely sensitive to violence).
Anyway, this is how The Passion of The Christ left me feeling (roughly), along with "that was a brilliant and powerful film that everybody should see". So I will now stop my rambling and finish by saying that The Passion of the Christ is one of the most important films I have ever seen, and you should give it a go, even if you don't like subtitled films. The Passion of The Christ is essential viewing!!!