Oh, you mean where the Church is still taken seriously
I don't think the Church is taken seriously there. Of course, they think they take it seriously, but if you look more closely, for the majority of people in Poland the Catholic Church is foremost a set of rituals.
the Church is the foundation of Poland and it has worked just fine
Few people realize that, but Poland started to invent itself shortly before the time of adopting Christianity in 966 which at first was nothing more than baptizing the ruler and his court. I'm sure she would have continued the process without the Act of 966, nevertheless Christianity would have come, albeit somewhat later.
Poland knows enough to call sin sin and homosexuality is immoral sin
I can guarantee to you that Poland is as biased in calling sin sin as any other nation on this planet, including the US.