bezwyznaniowy (Polish) comes from Polish wyznaniowy, from Polish wyznanie, from Polish wyznać, from Polish znać, from Proto-Slavic znati, from Proto-Balto-Slavic źnōˀtei, from Proto-Indo-European ǵnéh₃t, from Proto-Indo-European ǵneh₃- — to know.
bezwyznaniowy (Polish): nondenominational