Their strength was very much in their community. I think that if some had stayed and some had left, that they would not have made it. It was the grace of God, yes, but also their fraternity which held them together. I loved seeing that. I loved seeing how they loved, both each other and the community they were living in. I love how you could see Christian grow throughout the movie. I love the old monk -- he was hilarious! :) Without, usually, saying a thing. Just wait until you see the part with him and the young one! Ahh! Funny!
I love how the "bad guys" weren't demonized. They were seen as fellow humans. Ones who clearly did horrible things, but people with their own emotions and needs as well.
Reality is not much like a action movie. Something happens, then there's usually a lot of time to reflect and worry. The film really lets you sit there in these moments along with the characters, to have time to get inside their experience and think about things. You also aren't bombarded by ridiculous amounts of in-your-face blood and guts, like so many modern good vs. evil movies, but see things as you often see them. In passing, for a second, out of the corner of an eye. Which I think makes each moment stand out that much more, for the brevity in which it is shown. Plus, it adds to the humanity of the victim. They aren't just props used in the movie to illustrate the evil of the villain, but people.