From my perspective, I was completely blown away when I first realised that foreigns would look at my country (in internet groups) and declare it absolute christian, almost fundamentalist. When these people got me the stats that they were looking at, I was also blown away. According to census, 98% of the Portuguese population *is* a christian. I couldn't reconcile it with my reality, where most of the people I met along my life were either really soft deists, agnostics, "wouldn't care-ists", full blown atheists and one or two christians. Didn't match.
Then I figured it out. Those 98% quoted in all international orgs, etc., is just the number of "christians" that the catholic church was accounting for. How they did this? Well, they just counted every single person who was baptized! No wonder the mismatch! Everyone I know is in fact baptized, but that's so hardly correlated to what they actually believe that's not even a joke.
So no, these news are not foreign nor news to me for a long time. The major reason why Catholicism took a real beating for the past 50 years is mostly due to its connections with the fascist regimes. In Portugal (and in many other EU countries) for example, the Chruch was high up there with Salazar and absoslutely joyfully cooperative. They maintained the propaganda status quo. Of course, when the revolution came, no one was too happy about the Chuch's role.
In Portugal's case (and I guess similar things happened in other countries ruled by fascists), the Church just quieted down and pretended history didn't exist, etc., all the religious people were just embarrassed by all the situation and neglected a lot their christian duty to proselityze. A curious social phenomena started to happen. Parents were religious while their sons were not, and there was no backlash whatsoever. Meanwhile, the revolution was made by the communists and socialists and they mostly managed to arrange a proper secularized government, and all public discussion about religion just disappeared. Add to that the growing education stats and all the things already outlined here, it is no wonder that the churches are becoming empty. They are even having trouble forming priests to do the jobs.