It's not the satanist who are bad but the other guys ... or something along those lines. But the movie does not try to give us a message, it just tries to have some fun with quite a lot of cliches. It is a short movie and you can say it is short and sweet. Though your definition of sweet may be called into question after watching some of the things depicted in this movie.
It's not for the faint hearted and if you don't like people being made fun of, or dakr comedy is not your thing, this is not yours. Or maybe if you don't like certain types of metal music either. But you would lose out on an interesting short experience with really good acting and some very funny ideas. And because it is short it is not a time waster either ...