I vaguely remember seeing an episode of Sci-Fi series many many years ago. It was something about a conquering alien race coming to Earth.

In this episode a priest brought a Bible to the alien race on their mothership, trying to convince them to adopt a peaceful way. Alien commander enjoyed reading the Bible, but the only conclusion he got is that enemies needed to be crushed hard, which clearly was not the priest intention. Unfortunately I can't remember anything else.

Can someone tell me what series was?