what our non-catholic FRiends don’t seem to understand is the Catholic Church has been contending with unbelievers for 2,000 years, whether we are talking about jews, arians, gnostics, muslims, etc etc. the fact that 16th century sects arose was just more error to contend with.
So are you prepare to tell us the Eastern Orthodox doctrine is in error? Be careful how you answer. The Catholic Church is more about politics these days than theology. Why, you might even find the pope kissing the Koran and saying we all worship the same God of Abraham. Certainly the Catholics here wouldn't disagree with that would they?