They are Baptist, why would they have a Catholic wedding?
While it isn’t unusual to see depictions of Christ behind the pulpit of a Baptist church, the halos around his (and, presumably, Matthew, Mark, Luke and John’s) head would seem more common to a Catholic or Orthodox church (with Orthodox churches being quite rare in the mid-century South).
I didn’t see a cross or crucifix, which would have been more definitive.
So it might be a Baptist building, but the iconology would be a bit out of norm.