Arkadelphia by Samuel Brett Williams

Bobby returns to his hometown of Arkadelphia, a small religious community where cursing is banned and Wal-Mart is a way of life. His two best friends are eager to hear about his first semester of college in Manhattan, but something about Bobby is different and even he can't figure out why he feels so out of place. Trying to recapture the bond he and his friends once shared, Bobby ends up exposing a secret Arkadelphia would rather keep buried.