I can add a colourful update to my old post in this thread, though as it refers to just one person it isn't entirely within the spirit of the thread. But whatever. My Great-Great Grandad was for a time a Salvationist - having apparently converted after seeing The Light in the middle of the street while presumably quite drunk - but had a big fall out over some minor issue or other and returned (but as an observant member rather than a purely nominal one) to the Primitives.
Primitives? Do you mean some form of Calvinist Baptist? Wikipedia is not helpful here, so I am unsure of your meaning.