They lost a suit several years ago.
There are similar Christian camp meeting communities up and down the East coast. We don't live in OG, but my father lived there after WW1 (!), we're close enough that I go there most days to walk or jog, my wife sings in the summer choir, and my daughter plays (occasionally now) in the summer band. One reason that we've never purchased a house there is that the town is mainly 100+ year old wooden houses that are all built a few feet from each other. Another is that the streets were planned before the invention of the motor vehicle and so parking is an issue every summer. But for all its quirks and quirky residents we still love the place.
Some years ago the Camp Meeting Association required all motor vehicles removed from the town on Sunday and eventually the state's SC ruled that unconstitutional. A newspaper deliveryman sued claiming that his business was hurt because of the restriction and the court agreed. You can still see the iron loops from the chains that they used to block the entrances on Sundays. They still close the beaches on Sunday until Noon.
I imagine that there are still deed restrictions -- property "owners" actually have a 99 year lease and the land is technically owned by the Camp Meeting Association.
But I don't see how community deed restrictions that discriminate could possibly be enforceable now in 2018 -- or could have been for the last 50 years.
Does Ronald Naldi of the Met still sing in the choir? We sold our OG home because of property tax hikes and an annoying neighbor. It is my Lost Horizon. I belonged to so many clubs in that town and on a hot summer Sunday, to sit in the back, and listen to the choir, was heaven on earth.