Got sent this fascinating chart from the Third Reich that shows how specific German laws were over working out your blood ancestry. It wasn’t about religion, but bloodline. If you had the right ancestors you had the privileges’ of citizenship, and if you didn’t you had less rights.
I am not considered Jewish as my mother wasn’t Jewish. But according to the Nazis I would be classified as a Jew as I would have been a child of mixed ancestry of the 1st grade. I would have needed permission from the Nazis to marry a non-Jew.
It’s a good reminder that rights of citizenship should not be dependent on your bloodline.