That doesn't make any sense at all as presented. They were both black right? And they were church members? Maybe there's more to the story, in that the couple were causing problems and they weren't turned away for being black but for some other reason that the other people were objecting to it?
If the story is true as presented, then I think the church should have obviously wed the couple since they allowed them to be tithing church members.
If they wanted to be a white separatist church they shouldn't have allowed them as members in the first place, but if they were open to members of all races then they need to give full services to everyone in the congregation.