I think waht Mel is doing is exposing this culture to the light of day. And it doesn't look good. I expect to see him do the same with other cultures that have been PC'd into nice guys when in fact, they were awful people.
That is my take on it. This is a destruction of PC.
I will add that the contrast between the sacifice of humans to the Mayan gods stands in stark contrast to the sacrife of Jesus, the Son of God.
I think Mel is building a case for Jesus. A really good case.