Pal's religious overtones in overdrive in this movie
Pal was never afriad to add a bit of scripture to his scripts.
when pastor collins walks out quoting psalm 24, the effect is meant to show that aliens are godless heathens, and by killing a human they have sown the seeds of their own destruction, because god will take revenge, eventually in the form of bacteria.
But,
he inadvertently opens up a roland emmerich style moment, that believing in god will not save you from disaster, like emmerich does in 2012.
as we all probably know, emmerich is a Pal acolyte, borrowing heavily from his movies, but with a distaste for the religious side of things.
Pointless witty comment here ...