The problem is that Europe is split up into dozens of countries with very somewhat different values and cultures, so whenever you say "In Europe X happens", then you can always invoke some version of your argument.
Europe is France, Netherlands, Albania, Moldova. All of these are very different in various statistics.
Neither of those are true for Europe.
I would argue that it is fair to say that the US is more homogeneous than Europe, especially if you are talking about the entire Europe, and not just the EU.
But, how common is it really in Croatia or Poland to use christian terms such as "satanist" when you want to say that you are an atheist?
If, say, a courthouse has a statue of a religious theme, then by the law of the land, the courthouse must be willing to erect a statue for any religion. Like, say, a statue of Baphomet. Or they can remove _all_ of the religious iconography. That demographics are mostly Christian and so such things are overtly offensive makes it more effective.
So, atheists or agnostics or even people of more orthodox religious persuasion are using the Church of Satan as a vehicle of representation for a strong stance on the separation of church and state.
in Croatia at least, they use the term "communist" or "child of a yugoslav officer" to slander atheists or secularists.
