Cringe away. In a lot of ways Protestants
are closer to Catholics. This isn't polemic, but observation. Of course in a lot of other ways the RCC is much closer to the Orthodox than Protestants are. Those are some pretty broad brush statements, even "Protestant" covers everything from high church liturgical groups to who knows what all.
I stick with St Photios when he says in the end the only thing which divides us is the Filioque. Of course, that can't really be addressed without looking at the claims of the papacy, and things have gotten considerably worse since St Photios' time with anathemas that condemn the Orthodox. For example...
"if anyone says that blessed Peter the apostle was not appointed by Christ the lord as prince of all the apostles and visible head of the whole church militant; or that it was a primacy of honor only and not one of true and proper jurisdiction that he directly and immediately received from our lord Jesus Christ himself: let him be anathema."
"if anyone says that it is not by the institution of Christ the lord himself (that is to say, by divine law) that blessed Peter should have perpetual successors in the primacy over the whole church; or that the Roman pontiff is not the successor of blessed Peter in this primacy: let him be anathema."
"if anyone says that the Roman pontiff has merely an office of supervision and guidance, and not the full and supreme power of jurisdiction over the whole church, and this not only in matters of faith and morals, but also in those which concern the discipline and government of the church dispersed throughout the whole world; or that he has only the principal part, but not the absolute fullness, of this supreme power; or that this power of his is not ordinary and immediate both over all and each of the churches and over all and each of the pastors and faithful: let him be anathema."
"we teach and define as a divinely revealed dogma that when the Roman pontiff speaks EX CATHEDRA, that is, when, in the exercise of his office as shepherd and teacher of all Christians, in virtue of his supreme apostolic authority, he defines a doctrine concerning faith or morals to be held by the whole church, he possesses, by the divine assistance promised to him in blessed Peter, that infallibility which the divine Redeemer willed his church to enjoy in defining doctrine concerning faith or morals. Therefore, such definitions of the Roman pontiff are of themselves, and not by the consent of the church, irreformable. So then, should anyone, which God forbid, have the temerity to reject this definition of ours: let him be anathema."
So I suppose at this point it is 4x anathemas on papal infallibility and jurisdiction AND the filioque which separate us, and you really can't get to the latter without going through the former at this point.
Also to be more on topic, here is a homily by St Mark of Ephesus regarding purgatory.
https://nftu.net/first-homily-of-st-mark-of-ephesus-on-prayer-for-the-dead-and-against-the-roman-catholic-purgatory/