The Catholic Church and the Orthodox Churches:
A Shared Faith Divided by History
By Chris M. Forte
When people hear “Orthodox Church,” they often imagine incense-filled temples, icon-covered walls, and long bearded priests chanting in Greek or Slavonic. Yet behind those images lies something far more profound: a Church that has preserved apostolic succession, valid sacraments, and the faith of the first centuries with an integrity few Protestants can comprehend.
As a Catholic, I don’t see the Orthodox as “separated brethren” in the same sense as Protestants. They are family — estranged perhaps, but still family. And the Catholic Church, in her official teaching, agrees.
1. What the Catholic Church Officially Teaches
The Second Vatican Council spoke clearly on this relationship in Unitatis Redintegratio (1964), the Decree on Ecumenism:
“The Churches of the East possess true sacraments, above all, by apostolic succession, the priesthood and the Eucharist, whereby they are linked with us in closest intimacy.” — UR §15
That’s extraordinary language. The Catholic Church recognizes the Orthodox Churches as true Churches, not mere “ecclesial communities.” They have:
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A valid Eucharist (the real Body and Blood of Christ).
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Valid Holy Orders and apostolic succession.
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The same seven sacraments instituted by Christ.
The Catechism echoes this teaching:
“These Churches, although separated from us, possess true sacraments, above all by apostolic succession, the priesthood and the Eucharist, whereby they are still joined to us in closest intimacy.” — CCC §838
By contrast, most Protestant communities are described as lacking apostolic succession and therefore lacking the full sacramental life of the Church. So, when Catholics speak of “the Orthodox,” we’re not talking about outsiders; we’re talking about brothers and sisters who share our roots but live across a family divide.
2. The Eastern Orthodox and the Oriental Orthodox
It’s important to distinguish between the two major groups commonly called “Orthodox.”
2.1 The Eastern Orthodox Churches
These are the Churches that broke communion with Rome in 1054, the year of the Great Schism — the Patriarchates of Constantinople, Alexandria, Antioch, and Jerusalem, along with their national churches (Greek, Russian, Serbian, Bulgarian, etc.). They all accept the first seven ecumenical councils.
2.2 The Oriental Orthodox Churches
These include the Coptic, Armenian, Syriac, Ethiopian, and Malankara (Indian) Orthodox Churches. They separated much earlier, in the 5th century, after the Council of Chalcedon (451 AD) due to disagreements over how Christ’s divine and human natures were defined.
While doctrinally distinct, the Catholic Church recognizes both groups as ancient, apostolic, and sacramental. Orientalium Ecclesiarum (1964), the Vatican II decree on Eastern Churches, states:
“These individual Churches, whether of the East or of the West, although they differ somewhat among themselves in rite, maintain a remarkable unity in faith and sacramental life.” — OE §2
In other words: they’re different in expression, not in essence.
3. Why Communion Broke — and Why It Still Matters
The division wasn’t caused by one single event or doctrine. It was a centuries-long process fueled by politics, language, and wounded pride. Issues like papal primacy, the Filioque clause in the Creed, and the authority of councils became flashpoints, but underneath it all lay competing visions of what the Church should look like.
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The Catholic vision developed around a universal communion under one bishop — the Bishop of Rome — as visible head and guarantor of unity.
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The Orthodox vision preserved the ancient model of conciliarity — local Churches governed by their bishops, with patriarchs acting as first among equals.
Vatican II summarized the Catholic position beautifully:
“The Roman Pontiff, as the successor of Peter, is the perpetual and visible source and foundation of unity.” — Lumen Gentium §23
The Orthodox honor the Bishop of Rome as primus inter pares (“first among equals”) but reject the claim of universal jurisdiction. Ironically, even their rejection acknowledges a kind of primacy; they just limit it to honor, not authority.
4. My Perspective: Unity with Diversity
Personally, I consider the Orthodox Churches to be just as legitimate as the Catholic Church in apostolic origin, sacramental grace, and fidelity to tradition. When someone tells me they’ve joined the Greek or Russian Orthodox Church, I don’t feel disappointment — I feel relief. At least they’re anchored in apostolic Christianity. That’s infinitely better than drifting into the cafeteria chaos of modern Protestantism.
But I also see what’s missing.
The Orthodox world is profoundly regionalized: Greek Orthodox, Russian Orthodox, Romanian Orthodox, etc. Each Church is deeply tied to its culture, language, and politics. That can be beautiful — but also limiting. The Catholic Church, by contrast, is universal. Its very name means “according to the whole.” Whether you’re in Manila, Madrid, or Mumbai, the Mass is the same sacrifice, the same Church. Catholicism transcends nation and ethnicity; Orthodoxy often doesn’t.
5. Authority Without a Center
This regional structure creates another problem: authority.
In theory, the Orthodox Church governs by council and consensus. In practice, that means each autocephalous Church can excommunicate another, recognize or reject a council, and interpret tradition differently — and there’s no central authority to settle disputes.
Take the recent rift between the Moscow Patriarchate and the Ecumenical Patriarchate of Constantinople over Ukraine’s autocephaly (2019). One declared the new Ukrainian Church legitimate; the other called it schismatic. Both claim to speak for Orthodoxy.
Without a single arbiter like the Pope, division festers quietly. The Catholic Church isn’t immune to conflict, but at least it has a referee.
Even Pope Benedict XVI once remarked:
“The lack of a single voice in Orthodoxy prevents the world from hearing one unified testimony of the Christian East.” — Address to the Patriarch of Constantinople, 2006
6. The Unspoken Sign of Hope
What I find fascinating is that, even after a thousand years of separation, no Orthodox Church has ever appointed its own “Patriarch of Rome” or “Patriarch of the West.”
They’ve created Patriarchs for Antioch, Alexandria, Moscow, Jerusalem — but not for Rome. Why?
Because deep down, they know Rome isn’t just another diocese. The title “First Among Equals” still carries weight. Even in rejecting papal supremacy, they haven’t replaced the Pope with anyone else. The chair of Peter remains symbolically empty, waiting to be filled again in unity.
That, to me, speaks volumes. It shows that somewhere in the Orthodox heart still beats the memory of that early, undivided Church where East and West shared one faith and one cup.
7. The Catholic Vision of Reunion
The Catholic Church does not demand submission — it invites reunion. Pope John Paul II famously said:
“The Church must breathe with her two lungs — of the East and of the West.” — Ut Unum Sint (1995), §54
Reunion would not mean the Orthodox becoming “Romanized.” The Church has repeatedly affirmed that Eastern rites, liturgies, and traditions are not only valid but treasures to be preserved. Orientalium Ecclesiarum §6 explicitly calls them “equal in dignity.”
What reunion would restore is the one thing Orthodoxy lacks: visible unity under one shepherd, the same unity Christ prayed for in John 17:
“That they may be one, as You, Father, are in Me and I in You.”
8. Conclusion: Two Halves of a Broken Whole
The Catholic and Orthodox Churches are like two siblings who resemble their parents so closely that outsiders can hardly tell them apart — yet they refuse to sit at the same table.
Still, the door is open. The Catholic Church recognizes the Orthodox sacraments, invites their faithful to communion in cases of necessity, and prays daily for reunion. The differences are real, but so is the shared faith.
From my perspective, the Orthodox Churches are the closest thing on earth to Catholicism — and in many ways, still part of it mystically. They carry the ancient fire; we carry the universal light. And one day, I believe, both flames will burn as one again.
“That they all may be one… so that the world may believe.” — John 17:21
Selected References (Chicago Style)
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Unitatis Redintegratio, Vatican II, 1964.
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Orientalium Ecclesiarum, Vatican II, 1964.
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Lumen Gentium, Vatican II, 1964.
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Catechism of the Catholic Church §§836-838.
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John Paul II, Ut Unum Sint, 1995.
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Benedict XVI, Address to the Ecumenical Patriarch (Nov 30, 2006).
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Joseph Ratzinger, Principles of Catholic Theology (San Francisco: Ignatius, 1987).
