[dyed_in_the_wool]

they are not affiliated with any church and they pass the cult on through oral teaching from generation to generation.

Probably goes back to experience in Ireland when Catholicism was outlawed and religion was passed on orally via schenacies.
In fact, the only place you could legally celebrate a Catholic mass in English in the 1730s was right here in Philadelphia.

[Domestic Church]

I know of a DRE, who works in their parish in South Carolina.