So cultural imports are fine as long as when they arrive they say that they're English?
Christianity comes from the middle-east and was shaped as the state religion of the Roman empire. The Anglo-Saxons were converted to Christianity by Roman & Frankish preachers who advocated them abandoning their own cultural identity in favour of Romano-Greco cultural imperialism.
each Christian nation
So is England a Christian nation? Is this why you mention English hymns? This means that to be English you have to be Christian? And what about all our traditions which are considered "pagan"?