The problem with this theory is that religious people who believe Sky Semite is watching still behave horribly.  Especially if there's some kind of religious contextual justification.  Whether it's IFBs covering up sexual abuse, Cologne Muslims raping women for not wearing enough clothing, or Hasidic Jews trying to run over bikers and generally being insufferable cunts.  They use up all their emotional energy on rules and thus don't care about things that aren't in the rules, like being humane to unbelievers.