Although there was nothing overtly Christian in the original movies, hero Frank Kersey prominently wore a cross. He operated under God’s law and ignored man’s law. This is what gave him the authority to be judge, jury and executioner. It will be interesting to see if they kept the God’s law angle.
If somebody in, say, Chicago, starts killing people like the movie’s hero it will probably be the end of the series. We never saw Kersey kill the wrong guy by mistake or hit some innocent kid with a poorly aimed shot. Fiction does not translate well to real life.
“He operated under God’s law and ignored man’s law. This is what gave him the authority to be judge, jury and executioner.”
God’s law says “Vengeance is mine, sayeth the Lord” :P