Because the architecture looks more domestic than institutional, I’m not sure if this building was always a church. For many years it was home to the Keller Community Baptist Church and is located next door to the historic Bryan Neck Presbyterian Church.
Vanishing Georgia: Photographs by Brian Brown 
Maybe a cottage built during the Henry Ford era?
Sure looks like it was originally built as someone’s house. Property records may tell the story.
Same to me, Rafe.