I doubt there would be only one church in Smallville. You're talking about the American Midwest here, remember -- that's the Bible Belt. I lived in Indiana for 3 years in my teens, and even the tiny little town that had sprung up outside the Crane Naval Ammunition Depot had something like 4 or 5 churches in it.
Currently, I live in Southern California, in a town of about 30,000. Ramona was one of the old mining towns from the American Gold Rush, circa 1849. It currently has something like fifteen churches or more, so I can say with some authority that Smallville would have at least 3 or 4.
As for whether you could tell if it was the pastor or an assistant, it would depend on the church and the pastor's particular choice of what to wear at services. In many cases, no, you would not be able to tell unless you personally knew him.
Nan
