My Google image search also turned up this, which I had to use because it features "Buddy Christ" from Kevin Smith's Dogma. I can't tell for sure, but while the site seems sincere, I would guess that the author knew the source of this image. But it's more fun to think that he wasn't in on the joke.
On an unrelated note, it seems the Witt's mystery needn't have been quite so puzzling, at least if I had been able to ask the folks who decorated the Lund's in Nordeast. I snapped this iPhone shot of the vintage photographs behind the cashiers: