"The Faith is Europe. And Europe is the Faith."
So observed Hilaire Belloc. Here are some stats on both, from Europe: Church Attendance High in Catholic Countries, Protestants Less Keen on Worship:

Europeans are not the world’s most notorious churchgoers. But Catholic and Orthodox countries register relatively high attendance figures compared to predominantly Protestant nations. This is the result of a study by the research group World Views in Mastershausen, Germany, based on statistics of the European Union. According to the secular institute, Catholic Poland has the highest figures with 56.7 percent of the population going to mass on any given Sunday. Runner up is Portugal – also predominantly Catholic – with 30 percent, followed by Greece (Orthodox) with 24.5 percent. Worship figures in Protestant countries are significantly lower. Switzerland – mainly of the reformed Calvinist tradition – has the highest Protestant church attendance with 13 percent. In Germany, where Protestants and Catholics represent a third of the population each, the figure is 8.2 percent. At the bottom of the list are Scandinavian and Baltic countries: Sweden and Estonia (3.9 percent each) and Denmark (3.2).

[link via Catholic and Enjoying It!]

Always one to be reminded of something, I thought of this passage of dialogue from Father Elijah: An Apocalypse (review forthcoming):

It is a fascinating phenomenon... that the fault-line of the northern Reformation corresponds more or less to the old frontiers of the Roman Empire. Civilization and Catholicism to the south; barbarians, and hence Protestantism, to the north.