Q & A of the Catholic Faith: “The Oldest Catholic Church Still Standing: A Historic and Biblical Defense of Apostolic Continuity”

Description

Explore the oldest Catholic church still in existence — Cathedral of Saint Domnius in Split, Croatia — with Scripture, early Church Fathers, historical timelines, and apologetic responses to Protestant objections. Learn how this ancient edifice supports the unbroken continuity of the Catholic faith from the apostles to today.

🏛️ Introduction: Why This Matters

One common Protestant objection questions the historic continuity of the Catholic Church:

“If the Catholic Church is the true Church, where is its oldest building, and how can history confirm continuity from the apostles?”

To answer this, we examine the oldest Catholic church still standing and still in use, trace its development, and anchor our understanding in Scripture, early Christian writers, historical evidence, and Catholic teaching.

🏆 A Church That Withstood Time: Cathedral of Saint Domnius (Split, Croatia)

📍 Where and What Is It?

Name: Cathedral of Saint Domnius
Location: Split, Croatia
Original Structure Built: ~A.D. 305 (as Diocletian’s Mausoleum)
Converted to Church/Cathedral: ~6th–7th century A.D.
Status: Still in use today as a Catholic cathedral.

Unlike many ancient church ruins, this edifice exists today in its original structure and continues to be a place of worship — making it one of the oldest functioning Catholic cathedrals in the world.

📚 Historical Timeline of Catholic Church Development

Year (Approx)	Event
30–33 A.D.	Death & Resurrection of Jesus Christ (Acts 2:22–36)
33 A.D.	Pentecost: Church established (Acts 2:1–41)
c. 50–100 A.D.	New Testament writings
c. 100–150 A.D.	Early Christian apologists (e.g., Ignatius, Polycarp)
c. 200–300 A.D.	Church building begins
A.D. 305	Diocletian’s mausoleum constructed
6th/7th c. A.D.	Cathedral of Saint Domnius established
313 A.D.	Edict of Milan legalizes Christianity
380 A.D.	Christianity becomes state religion of Roman Empire

📜 Biblical Basis for Church Continuity

The Catholic understanding of the Church’s continuity from the apostles is rooted in Scripture:

1. Jesus Establishes the Church

“And I tell you, you are Peter, and on this rock I will build my church…”
— Matthew 16:18

This verse has been historically interpreted by Catholics to mean Christ established an enduring Church with authority.

2. Apostolic Succession

Paul speaks of the continuation of teaching through appointed leaders:

“And what you have heard from me through many witnesses entrust to faithful men…”
— 2 Timothy 2:2

3. Unity of Believers

“…one body and one Spirit… one Lord, one faith, one baptism…”
— Ephesians 4:4–5

Catholics see the unbroken line of teaching, leadership, and worship as evidence of unity from the apostles to the present.

🧾 Earliest Church Fathers Affirm Continuity

Early Christian leaders provide eyewitness testimony on the Church’s structure and continuity:

Saint Clement of Rome (c. A.D. 95)

“Let us seek with the greatest zeal the old and approved standard…”
— 1 Clement 42

Clement defends apostolic order and tradition against schism.

Ignatius of Antioch (c. A.D. 110)

“Wherever the bishop appears, let the congregation be; just as wherever Jesus Christ is, there is the Catholic Church.”

Ignatius clearly teaches about a structured Church with bishops.

Irenaeus of Lyons (c. A.D. 180)

“…the Church, spread throughout the whole world… receiving the tradition from the apostles… continues in the faithful preservation of this tradition.”
— Against Heresies III

He stresses unbroken tradition and succession.

🛡️ Answering Protestant Objections

❓ “The Catholic Church is a later invention, not connected to the apostles.”

Response:
The early Fathers (Clement, Ignatius, Irenaeus) lived in the 1st–2nd centuries A.D. and wrote about an organized Church with bishops, sacraments, and continuity — centuries before the first medieval cathedral was built.

❓ “The Church didn’t exist until after Constantine.”

Response:
Christian worship communities existed long before Christianity became legal. Buildings like house churches and later dedicated churches grew after legal recognition but the Church itself existed from Pentecost (Acts 2).

❓ “Oldest church ruins are not Catholic.”

Response:
Churches like Dura-Europos (c. 232 A.D.) existed before Constantine, but they don’t still stand today. The Cathedral of Saint Domnius is architecturally preserved and still in use — distinct evidence of continuity.

📌 Why This Matters Theologically

The existence of an ancient Catholic cathedral in continuous use strengthens the claim:
✔ The Church is not a modern invention
✔ Christianity had recognizable structure, worship, and continuity very early
✔ Catholic tradition matches historical, archaeological, and textual evidence

🙏 Conclusion

The Cathedral of Saint Domnius stands as a powerful witness to the historical and spiritual continuity of the Catholic Church — anchored in Scripture, affirmed by the early Fathers, and preserved in history. For believers seeking the roots of Christian unity and authenticity, this and similar evidence affirm that Catholicism did not begin centuries later but traces back to Christ and the apostles directly.

🧠 Key References & Sources

Bible Verses: Matthew 16:18; 2 Timothy 2:2; Ephesians 4:4–5
Church Fathers: Clement, Ignatius, Irenaeus
Church Teaching: Catechism of the Catholic Church on Tradition & Apostolicity
Historical Data: Dating of Cathedral of Saint Domnius

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Friday, January 23, 2026

“The Oldest Catholic Church Still Standing: A Historic and Biblical Defense of Apostolic Continuity”