Secular liberals are estranged from religion. The movie may have a medieval look to it - but it does NOT have a medieval feel to it. In the Middle Ages, faith was the center of every one's life from birth to death. Even secular literature is theocentric in the sense that people are living and acting out their faith in the every day world. Its a world that's long gone but Hollywood is not one to capture it for modern movie goers. Enlightened individuals no longer think much of or about religion - if they think about it at all. To rephrase a cliche, there's no Heaven in Ridley Scott's Kingdom!
(Denny Crane: "Sometimes you can only look for answers from God and failing that... and Fox News".) I would love to see a real movie that tried to capture the feelings and beliefs of the times -- not trying to whitewash the slaughters, but to try to be authentic rather than trying to make politically correct anachronistic points.