The use of the word "causus" in the Catholic thread only means that you can't troll it. You do not have to be Catholic to post there. You just can't "Jaquie Blackie" it, if you get my drift.
JockoManning just posted the Religion Moderator’s rules:
“The Religion Moderator posted her criteria and rules for Caucus threads on the RM’s page long ago.
1. If you are not a member of the Caucus—don’t post on that thread.
2. Of upi are a member of the Caucus and posting on the thread—DO NOT provoke or trigger your NONCaucus members opponents; say negative things about them on the Caucus thread.
3. If you have a genuine question, PM one of the posters on the Caucus thread. Or ask in a non-Caucus thread.
4. There are also Evangelical, Charismatic etc. Caucus threads on occasion.”
You do not have to be Catholic to post there.
You do have to be a member of the caucus designation, unless you are invited.