No one said they weren't interested in standing stones in graveyards or stones incorporated into buildings, just not pictures of churches.
I could easily get together a list of over a thousand Irish church ruins that are almost certainly built on earlier pagan places, but I don't see how they fit in with the ethos of TMA. Would the megalithic portal let them in? I think not.
A site dedicated to them would be fascinating and I personally include Early Christian stuff on magalithomania because of the reasons we have stated, but TMA ain't about that. Is it?