I would think that a small-town musician probably knew hymns from all denominations - from being pressed into service for neighbors and friends.
I’m a cradle Episcopalian, and I’ve heard this hymn many many times over the years, especially at funerals (it was sung at a funeral I attended a couple weeks ago). That is probably because something like 8 out of 10 Mississippians are Southern Baptists; people automatically assume you’re Baptist unless you tell them otherwise.
Well… I admit, this person seemed to know all kinds of music, from Episcopalian hymns to boogie-woogie to Tom Lehrer. She had a music degree from UCLA. I had a crush on her daughter, now as then a knockout.
I’ve heard it often enough, it was on some Time-Life gospel collection from the eighties as done by a famous singer (sorry can’t recall who it was), I think he probably charted with it back in the sixties or seventies or maybe earlier.
… actually I think every major singer who has done a gospel crossover album in the U.S. has probably sung it. It’s a pretty well entrenched gospel standard for as long as I can remember. I’m pretty sure Elvis has done it, as well as George Jones. Pretty cheesy.