Some people (who are very cool and also correct) point to the end of the Hussite wars in 1434 as Europe then had an established non-Catholic kingdom. Other people talk about Martin Luther’s 95 Theses in 1517 because they are boring and too lazy to learn Czech.
This. I already had to stick a microwave in a wall opening because the cats used it to jump back and forth from the kitchen to the dining room; if I had anything like that it would become a cat door in no time.