Here is the description for REHU-L found in A Shortlist of Discussion Forums for Theologians. For the most part, it is still applicable to REHU's successor, RELHUMOR-LIST.
This list (REligious HUmor) is an unmoderated forum for holy hilarity and religious revelry. The primary purpose of the list is to provide an arena for the escalation of occasional humor interjected into the dominantly serious discourse of ECCHST-L (Ecclesiastical History), but non-Ecchsters are welcome as well. The list is UNMODERATED, but not UNMONITORED. The list owner will intervene in the case of egregious offensiveness or ad hominem attacks (EXCEPT IN CASES WHERE IT IS WELL DESERVED).
I would add two notes about what RELHUMOR is not.
Religious Humor List | Elizabeth T. Knuth's Home Page
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What Is RELHUMOR? / Rev. 12 December 1998 / © Copyright 1998, Elizabeth T. Knuth / URL: http://www.users.csbsju.edu/~eknuth/rehu/rehuwhat.html