He is incorrect if he believes he can reject Papal infallibility, or the IC, or purgatory. These are articles of faith, or in other words dogma not theology. Theology expresses the dogmatic teaching of the Church in a manner consistant with the particular ancient tradition of the Church. Dogma is an essential truth about God.
Catholics can not be in communion if we do not accept the same dogmas, it is this issue that seperates us from the Orthodox not in communion with Rome. If Eastern Catholics held the same position, we would not be in full visible communion with them, it’s really that simple.
I think it more likely what has happened hear is that we are confusing, very greatly, the terms dogma and theology. A dogma is a truth expressed primarly at Church council, in communion with the Bishop of Rome, or in rare case by the Seat of Rome alone via infallible proclimation.
The IC, Purgatory, Papal Infallibility, these are all defined as such (By Proclimation, Trent and Vatican I respectivly). No Catholic can deny the essential truth, to do so obstinently makes one a heretic or forces them to be schismatic or both.
The dogma of the Immaculate Conception states that the Most Holy Virgin Mary never had any stain of sin on her soul, from her Conception. This was declared because of a form of an Augustinian notion of Original Sin being a “stain” (if someone could explain what such a “stain” entails, I would be grateful!).
The Eastern Churches have ALWAYS affirmed that Mary was without the slightest shadow of sin and accept a different view of Original Sin than that prevailing in the West. The Eastern Churches, including EC’s, see the “Immaculate Conception” as underlining that Mary was sanctified to the nth degree at her Conception - the emphasis is on sanctification/theosis rather than preventing her from contracting any “stain.”
This Eastern Church view of the Mother of God is actually much higher than the dogma of the IC - the East presupposes that she never had any sin and honoured her Holy and Sanctified Conception with a feastday in the sixth century. The West in England later adopted it. The Orthodox Catholic East does not need to be taught anything by the West with respect to its devotion to the Most Holy and All-Immaculate Mother of God surely! We only wonder what took you Western RC guys so long to see the light in this respect!
As for Purgatory, the East has a very high tradition of prayer for the dead and many liturgical times to pray for the dead. The East accepts that the souls of those in need of purification or the fulfillment of the works of repentance they didn’t do on earth are in a state where they can be prayed for. This state is sometimes called “Hades” in the liturgical services as opposed to the eternal hell that Christ will judge certain souls worthy of at His Second Coming. We can and must pray assiduously for the dead and, once again, the West can teach the East nothing in this regard.
With respect to papal infallibility, the East believes the Church through the Episcopate is infallible - period. Ecumenical Councils, when they have the signatures and approval of the ancient Patriarchates, with Rome being the first among them, express INFALLIBLE truth.
Papal infallibility is never above or separate from the Apostolic teaching of the Church. When the Ven. Pope Pius XII declared the dogma of the Assumption (very highly honoured in the Eastern Churches from Apostolic times and never in doubt), he consulted with the world’s bishops on this. Was this not a conciliar action, similar to what would be obtained under an EC Council? I think it was.
So when popes clarify doctrines and dogmas for the Latin Church, it is not always the case that such clarification is needed for the Eastern Churches. In fact, is there even one papal dogma to date that affirms something that the Eastern Churches have always believed and, yes, within the perspective of their own legitimate theological, canonical and spiritual traditions?
Roman Catholics, if I may say so, tend to often confuse the Latin expression of doctrine for the doctrine/dogma itself.
This seems to be systemic among Latin Catholics. It is also seen in aspects of the traditionalist Roman Catholic movement, as I am informed by Latin Catholic priest/professors.
Alex