And will the absolute bar on remaining in the British Royal Family's order of succession if one marries a Catholic remain?
Probably not - the prime ministers of the 16 Commonwealth realms agreed to remove the bar last October. About time!
Some of the royal families are pretty flexible about religion, it seems. Anne-Marie was raised Lutheran and became Greek Orthodox. Sophia was raised Greek Orthodox and became Roman Catholic. Maxima is Roman Catholic, yet agreed her daughters would be raised in the Dutch Reform Church. Mary was a Presbyterian and is now a Lutheran, I believe. Was Marie Catholic? Is she still?
Both Mary and Marie converted to Lutheranism. Princesses converting when they marry is actually nothing new - many were expected to.
Some folks got kicked out of the Dutch Royal family's order of succession for marrying Catholics without permission.
You mean Irene and Christina? They both lost their succession rights because they didn't get Parliament's permission, but it wasn't because their husbands were Catholics. Irene's husband was controversial because of his politics and Christina didn't ask for permission because she wanted to leave the royal house.
Is this a big deal anymore with the increasing secularization of Europe? Do you think it will ever change?
I think so. The Church of Sweden was disestablished in 2000 and the Church of Norway was disestablished earlier this year. I doubt the UK will follow suit any time soon, but it could happen 50 years from now. Europe is more and more secular, like you said - it would be the smart thing IMO.
Which royal houses are most adamant about religion?
Many of the European royals don't talk about their faith in public, but I've heard that Queen Sofía of Spain, Prince Willem-Alexander and Princess Máxima of the Netherlands, Princess Astrid and Prince Lorenz of Belgium, Queen Fabiola of Belgium, Queen Margrethe of Denmark, King Harald of Norway, and Queen Silvia of Sweden are very religious. And we all know about Princess Märtha Louise of Norway and her angels