Actually, this sign is pointing to the Baptist Church in the town of Only, TN. Only is a small town in Hickman County near where highway TN50 crosses the Harpeth River and has an intersection with Interstate 40.
On an old road surrounded by lush overgrowth, it seemes like there's no imaginable reason to be driving over here unless you want a closer look at the immpressive span of the train bridge that crosses the Duck River. At one time many decades ago this road was TN Highway 50 and I suspect was the main way west out of Centerville.