Maybe relevant, from Conversations with Tyler (Ep. 184, with David Bentley Hart):

  COWEN: Let’s say Poland, Slovenia, Czechia, which have a lot of Catholicism in their backgrounds — they seem to be converging on Western norms, living standards much more than, say, the EU members to the East: Bulgaria, Romania.

  HART: Well, they had certain advantages to begin with, too, but better relations. Again, I don’t think it has any particular... To be honest, Polish Catholicism is basically culturally very much like Slavic Orthodoxy. There, you’re going to find that culturally, Catholicism and Orthodoxy are closer to one another in many ways than Catholicism in the East is with Catholicism in the West.

  Trying to draw causal ties between what are very complex social histories, I just think is a mistake. There’s no way of saying one way or the other. Greek democracy flourished in the modern age for a while after Greek independence in the early 19th century, and Greece remains Orthodox, too. Even more than Poland, it is committed to a set of real democratic norms. In Poland, there are stronger reactionary forces at present than there are in Greece.

and also from Ep. 192, with Jacob Mikanowski:

  MIKANOWSKI: [...] I think that idea of an Orthodox disease is maybe a figment of geography more than a deeply cultural matrix that we think. I’m not — I think we could be optimistic about Croatia and Romania simultaneously. Bulgaria maybe too. I’m not sure that I believe in a kind of Orthodox curse. I think it has more to do with how things shook up internally in former Yugoslavia and where those countries are in relationship to that industrial core of Germany, Austria, Switzerland.