Ban this movie for being too realistic in what way? It has some good violence and gore and some looks pretty naff, there's far worse out there.
It's just a guy getting pissed off and punishing arseholes and the characters have a religion and beliefs, just like every human being on the planet.
Interestingly Uwe Bol the director makes films that generate no money as he uses an old tax law from his country that generates the funding. He doesn't to conform or please anyone to put out exactly what he's trying to say