Orthodox author Rod Dreher makes a good point:
You know that I deeply want Europe to return to its Christian roots, but doing so out of purely tribal, nationalistic reasons does not give one hope that such a return would be truly Christian.
The problem for people like me is that nationalistic religion is, unfortunately, part of tradition in many places. The reason I was pleased that Brexit won is that I am almost always in favor of the local over the global. To the extent that the EU threatened local identities, cultures, and traditions, I think it was a threat to be resisted. I would love to see Western Europe’s Catholic and Protestant churches filled again, but if Europeans returned to them not out of a love of God and a longing for His presence, but because it was part of sticking it to Them (whoever “Them” may be), then I’m concerned.
The Church can survive as a national religion, and it can survive as a persecuted minority. From the perspective of faith it is not clear which is really preferable.