You could default to it being off while you are of Novice level, and automagically switch over at Acolyte. By then you've spent enough time around the site to become immersed in the culture. Or, as buzzcuttbuddha mentions, you could just turn it on or off.
Since there is a sort of theme support, maybe you could choose the religion of your choice. Can I be a Reformed New Order Druid?
Comment on (jcwren) RE: RE: More monk-ish terminology
Having themes and setting the defaults for Anonymous Monk and any Novice (or maybe up until level 2-3, so people have something to earn ;) ) to "netspeak", and above to some themable thing would be quite cool.
About the theology/clergy question, I'd say either it would have to be complete themes from each kind of theology we come up with, or a mixture - which would both upset some people because "theirs" is not in or "in the wrong place" etc. - I'd like the themes approach better, as anyone can add easily descriptions for a new style of monastery.