Clans, roleplay groups, not to mention HERO, Helpers, and Thief/Killer/Outcast.... Do we really want to add another aspect to this game? Clans could substitute religion, or subskills can be used to get the bonus perks. Adding religion would not only yet another faction to the game that might overwhelm newbies, but it is a lot of coding work to add something like that to the mud, I assume. Nobody is going to volunteer for that right now, not when so much else is going on. Best stick with easier ways of accomplishing your goals.
Brought to you by my $0.02.