We sure got them all off in Catholic school.
I often tease Sonja, because Sweden is such a secular country; yet, they get all the Catholic holidays off!
True!
But then, Christianity was a major defining power in society for around 1000 years.
The church had a major impact on every aspect of society, government, people's lives, laws...everything.
The church was formally separated from the state only 26 years ago. Although its power had diminished considerably over the last, say, 100 years, it was only then that the legal divorce between them took place.