Re:A Cyrillic orthography for the Polish language
by keiferski on Thursday November 12, 2020 @12:47AM
(#25066868)
Those were probably Greek Rite Catholics, which is also popular in the Rusyn ethnicity (a Slavic group in the areas between Poland, Ukraine and Slovakia.) Different history than Polish Catholics.
https://en.m.wikipedia.org/wiki/Religion_in_Ukraine#Demograp...
Most of the Ukrainians and Belorussians I've met were either Catholic or had Catholic grannies (and were atheist/agnostic themselves).