Christian Britain?

(My Republican, in the Irish sense, sister would have fits that I used the word Britain, which she says does not exist - it is part of the "Celtish Isles.")
Interesting piece recently, can't remember where, that says the dire "fact" that everyone "knows" about the faith fading away in the UK is based on faulty and agenda-driven reading of statistics.
But now comes this, in the Economist:

Well, "gates of hell" and all that....