Well, if that's the case, the sites probably needs one of those new "debatable antiquiities" signs on it.
But Baza, are you inferring that "depressions on a christian cross" are natural, or wot? Cos that's crap! If they're natural, so are hundreds of other carvings in the British Isles. I assume you don't mean that though. So who carved the cups and when? The questions gotta be answered.