When cult is used to describe a movie it doesn't refer to a religious group, it refers to a small group of people that are die-hard fans of the movie. Classic meaning a definitive example of a cult movie. Have you ever seen the TV show firefly? That's an example of a cult TV show.
I can see why you didn't like it though, if you're not into that type of humour and stupid story lines, it brings nothing to the table.