As a European, I find it quite amusing that religion is so central to american culture, that they even figured out a way to make a christian version of atheism.
All this may be quite dependent on where you live (the mention of the "church tax" makes me suppose Germany, as they have a Kirchensteuer, but I'm sure other countries must have a similar tax). In any case, there are European countries without church tax, beyond normal taxes that could be used for preservation of historical sites, religious or otherwise (which I agree may be somewhat biased in what religious sites can pretend to be considered historical).
Similarly, many countries do not have "religion" classes in "publicly funded schools", especially in countries that are (supposedly or admittedly) laic. That being said, there's also often a bias there as a lot of holidays are tied to religion and Christianity in particular, and it'd be quite common to explain in class the origin and nature of these holidays. I'd hardly think it counts as "religion" class, though, but that'd depend on what the teachers do.
But, I still find this funny.
Other european countries are more laical or secular, but that is pretty much just flavor today.
Some eastern countries are more involved, but if you propose the church having relevant influence in central or western Europe, you really slept the last two decades.
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.