>>214240416
>but i meant germans that stayed in poland and assimilated into their society.
the vast majority of Germans who came to Poland in the Ostsiedlung process arrived here before Luther was born so religious differences weren't a thing yet, they indeed assimilated over time.
And after Luther as long as PLC existed, it didn't allow protestants in, so only catholic Germans were coming, and these assimilated easily too. The only exception were several 'designated protestant towns' on the border with Czechia and Brandeburg where protestant refugees from 30year war were allowed. But still, since as I said, religious distinction was more important than cultural/linguistic one, those protestants, even of Slavic (Czech or Polish) origin, usually germanized themselves even already in Poland, because they usually lived in the same communities with Germans and German culture attracted protties more. So as regular Germans, they were expelled after WW2 too.
The only little exception to that is the town of Zelรณw where a small Czech protestant community lives to this day but it's because they already came in 19th century when nationalism was already a thing and assimilation or changing your language/culture wasn't such an easy process like before.
When it comes to Prussians in the Prussian-occupied part of Poland, there was little assimilation because Prussian government sent only protestants there (because catholics were subjected to assimilation to Polish culture)