It might be necessary to keep in mind the peculiar religious scenario in Norway in order to understand this scenario.
In the Scandinavian countries the Evangelical Lutheran Church is the official state church and it had a very very strong influence on Norwegian culture and life. It still really does on its culture, but since the 1960s, when Norway went from being a poor country to a rich country, its attendance has really dropped off. None the less, every Norwegian is regarded as being a member unless that person takes the step to be officially stricken from its rolls.
The King, and half the cabinet, must be Lutherans.
As the country was traditionally a poor one, but with strong social cohesion, the Lutheran Church had a very strong roll in the average Lutheran’s life up until a couple of generations ago. Here too in certain parts of the US this was true amongst Norwegian descendants. But it was a pretty dour church in some ways, and since money started flowing into Scandinavia post World War Two, the same thing that’s happened everywhere where money came in happened there. Norwegians started to stop being adherent. The Lutheran church in Scandinavian countries has almost uniformly attempted to accommodate the cultural shift by adopting liberal theologies, which hasn’t served to stem the tide at all (a lesson for Catholic Germans there).
In recent years there’s been a very slow increase in Catholics in Scandinavia. In part, that’s due to immigration from Eastern Europe. In part, however, it’s also because all of Scandinavia was Catholic up until the Protestant Reformation/Revolution, and its impossible to stamp that memory out completely. As people drawn to Christ find the Lutheran Church lacking, they naturally become curious about the Church that brought Christianity to the region in the first place and find that it hasn’t changed.
But the anti Catholic feelings that were brought into Scandinavia during the Reformation (long story, but there certainly wasn’t a desire for it from the pews) took root over centuries of anti Catholic propaganda. Scandinavian culture became very anti Catholic, and while it is now no longer very adherent to Lutheranism, it remains very anti Catholic.
I don’t know about the story here, but my strong suspicion is we’re going to see a lot more of this sort of thing in the next few decades. With all the social upheaval in the Western world, the only serious religions have become Catholicism, Orthodoxy, and Islam, and they’re going to be the competitors for people’s souls. We’re already seeing Orthodoxy and Eastern Catholic churches on the rise again in Eastern Europe and we’re seeing a very slow reclamation by Catholicism in Scandinavia. Islam is making inroads everywhere in Western Europe. Once the current flood of social experimentation in North America does its damage, I suspect that the death of the Protestant churches will accelerate and these other faiths will be what principally remains as people begin to increase a search for actually satisfactory answers.