The Day the Earth Stood Still

I didn't know that the original had Christian allusions:

In the original, Klaatu the alien messenger descends from the heavens offering the gift of healing and bearing a message for the world that could mean either salvation or destruction. He is killed by small minded authorities but is resurrected a short time later; he delivers his final message of peace to the world before ascending back into the heavens. Oh and his cover name while walking among the humans? Mr Carpenter.
In the new movie he is just Klaatu, he walks on water, he doesn’t need resurrecting but he does resurrect someone else and his message is not so much one of salvation or destruction as a warning of impending destruction. In the first movie, intelligent space-faring civilizations of the cosmos warned humanity that if they didn’t give up our war-like ways they would cleanse the Earth of us. They could ignore us before we had nukes but now we were a threat to everyone. In the new movie the intelligent space-faring nations are alarmed at the environmental damage we are wreaking on Earth. Klaatu is kind of an alien Al Gore (“An Inconvenient Alien?”).
Read the rest at Uncommon Descent