From the Religion Moderator's profile:
"Posters who try to tear down other’s beliefs or use subterfuge to accomplish the same goal are the disrupters on ecumenic threads and will be booted from the thread and/or suspended."
[RM] Specifically, which posts do you find to be antagonistic?
To side with Satan (making silly jokes about his occult) is to be antagonistic towards Christian beliefs on same. For instance, if your child had autism and you put up a thread regarding his disease and I turned around and put up a couple of photos (keeping in mind your thread is an Ecumenical one) of cats acting retarded, would you then understand a little better what it means to be antagonistic?
Your cat example doesn't work since a person's autistic child would not be an adversary to the parent.
The vampire cult is an adversary to Christian belief which evidently you and the ones making fun of vampires share. I don't see how anyone who is not a vampire cult member could be antagonized by the ridicule of vampire cult beliefs.