Why are religious people so messed up?

Because being counter-Christian is a part of that counter-culture. If God is Order, then Satan is Chaos.

I’m not condemning, but making an observation. Alternative and new religions flourish in America that has a strong Christian-based culture, yet allows (or should allow) religious liberty for all religions. As such groups of people who feel pressure to conform may seek out the polar opposite as a nonconformist release. And Eastern religions even offer mystical systems that incorporate God/Satan, Good/Bad as a single entity or idea. 

The goth and punk rock cultures are easy access for many alienated youth who seek the darker spiritual side. And as both great good and bad can be perpetuated in the name of God, so can in it be done in the name Satan. I’m not ascribing this to any spiritual being or power, because it is the cultural consciousness of a society that drives the good or bad they do.