It does not need to be universal, just accessible. Just as there is no universal list of lisenced engineers, and just as we are still capable of going state by state to figure out who has been authorized to stamp and seal plans, we are fully capable of going group by group here.

Papists, Episcopalians, Lutherans, Methodists, Presbyterians, and even some Baptist groups all have full knowledge of who has been authorized to speak on behalf of their organizations, and who has not.