A group of demon killing, gun slinging, nobodies. Just random people who have some special power that allows them to see some humans for what they are: Cultists, Satanists, or demonic things. But, just to put something, one guy is an agnostic, and kind of hates the idea of Satan and God, so he calls the demons "The Soul-less" meaning he thinks they're un-human, not supernatural. They kill the Satanists and Cultists because they want to harness the power of the guy's gift to... maybe summon Satan? I dunno. That's my basic idea so far.