A case of vandalism — on the Billy Graham Parkway of all places. But it’s no coincidence. A group of atheists put up a billboard last week on that highway near Charlotte, N.C., with the words “One Nation Indivisible” over the backdrop of an American flag. Their point? That’s the way the Pledge of Allegiance was originally written back in 1892 — without the words “Under God.” Congress added that in 1954, but the vandals did it this weekend with a can of spray paint at the bottom of the billboard. The athiests say they’ll replace it.