What's that they say about the Holy Roman Empire? It was neither Holy nor Roman lol.
But it is what it was and it became Christendom. Europe then, was a Christian body politic. Secularists will chafe at that because it implies [they think] theocracy. What it really means, or meant, is that they were a predominantly Christian people who embraced Judeo-Christian values; their culture, art and architecture reflected it.
None of that, is worth saving to them. In fact, here in the states it's their 'evangelical' mission to get us to post-Christian as fast as possible. Even if it means allowing people in who don't share the same cultural values as we do.
And in their minds, we should be powerless to stop it. Hence, all the name-calling.
It's all so bloody transparent.