Why Do We Celebrate Christmas on December 25th? An Orthodox Reflection on History, Tradition, and Truth

Every December, as the days grow shorter and the world settles into the quiet of winter, the same claims reappear like clockwork: “Christians only borrowed the date of Christmas from pagans… December 25th is really the Winter Solstice… Christmas is nothing but a baptized pagan festival.”

You hear new phrases too, “Happy Solstice,” “Sunny-mas,” and other clever attempts to imply that the Feast of the Nativity of Christ is rooted not in divine revelation and historical memory, but in ancient mythology and sun-worship.

Yet when we step out of modern speculation and return to the actual historical record, when we listen to the early Church, to the Fathers, and to the ancient world itself, we discover a very different story. The claim that Christmas is a “Christianized pagan festival” is simply not supported by the writings, calendars, or historical practices of antiquity.

In fact, Christians celebrated the birth of Christ because they believed they knew when it happened.

And they believed this because the earliest communities preserved the memory, the Scriptures hinted at the timeline, and the Church confirmed it using documentation available from the Roman state itself.

The Early Church: No Hint of Pagan Borrowing
Our earliest Christian voices, St. John Chrysostom, Justin Martyr, Tertullian, and others, never even hint that Christmas was chosen to replace a pagan feast.
If such a thing had happened, these Fathers, who spent their lives rebuking paganism, would have surely mentioned it.

But they do not.
Instead, they focus on historical and theological reasoning.

It is well known that the early Church originally celebrated both the Nativity of Christ and His Baptism together on January 6, the Feast of Theophany. It was the Church of Rome that first separated these two great events and set December 25th as the day to celebrate the Lord’s Birth.

Why December 25th?
Because they believed this was the actual date.

St. John Chrysostom explains that the Church in Rome used historical data preserved in official Roman archives to determine the most likely date of the Savior’s birth.

Zechariah’s Priestly Service and the Timeline of Christ’s Birth
Chrysostom offers an interpretation rooted in Scripture itself:
By identifying the priestly “turn” (or service rotation) of Zechariah, the father of John the Baptist, in the Temple, the Church could estimate the conception of John the Baptist, and thus the conception and birth of Jesus.

According to this calculation, Christ’s birth would naturally fall in late December or early January.

This is not myth; this is historical method.

And the existence of such temple schedules is affirmed by the Jewish historian Josephus, who carefully documents the priestly orders of Jerusalem.

Likewise, in a letter to Archbishop Macarius of Jerusalem, Pope Julius I confirms that December 25th was chosen by appealing to records from the Roman imperial archives.

Roman Records: Census, Archives, and Administrative Detail
Justin Martyr, writing to Emperor Antoninus Pius, boldly states that the details of Christ’s birth in Bethlehem could be verified by consulting the official Roman census records.

Tertullian likewise notes that the census under Quirinius, mentioned in Luke’s Gospel, was “available in the official records of Rome.”

We sometimes forget that the Roman Empire kept meticulous records.
Decrees, census documents, and administrative notes were preserved in standardized systems such as:

• Acta Diurna (the “Daily Acts,” an official record similar to a government bulletin)
• Commentarii Principis (the Emperor’s administrative archives)

The census referenced by St. Luke is not some imagined folklore; historians today overwhelmingly accept that Roman provincial censuses for taxation were routine and well documented.

Yet in all this abundance of ancient evidence, not one early Christian writer, not one Roman source, not one Church Father claims that the date of Christmas had anything to do with paganism.

The Modern Myth of Pagan Borrowing
In our time, a popular narrative claims that Christians “borrowed” December 25th from the pagan worship of the Sun, or from Mithras, or from Dionysus. But this idea is a modern invention, an 18th-century fantasy created during the Enlightenment by people eager to dismiss the Christian faith as simply another myth.

When we examine the ancient world itself, the story collapses.

1. The Greeks and Romans never celebrated the “birth of the Sun” on December 25.
No ancient Greek or Roman festival on that date involved the Sun’s “birthday.”
None.
2. Dionysus had no connection to December 25.
The festivals of Dionysus, Anthesteria, Lenaia, and others, were tied to wine, agriculture, and fertility, and they occurred in different seasons.
3. Mithras, a Roman military cult, had no December 25 festival.
No inscription, no ancient calendar, no temple carving mentions a birth of Mithras on that day.
The cult was secretive, practiced only among elite soldiers, and did not have public festivals.
4. Emperor Aurelian did establish a temple to Sol Invictus, but not a birthday feast on December 25.

Aurelian built a magnificent temple to the “Unconquered Sun” around 274 AD.
We do not know the dedication date, and no ancient record states that December 25 was a public festival associated with this dedication.

The Chronograph of 354: Two Dates, One Calendar, No Connection
The Chronograph of 354, the earliest Christian calendar of Rome, contains two entries:

• December 25: Natalis Invicti (“Birthday of the Unconquered”) in the Roman civic calendar
• December 25: “Birth of Christ in Bethlehem of Judea” in the Christian ecclesiastical calendar

These are:

• two different calendars
• compiled from two different traditions
• placed side-by-side in a 4th-century Christian collection

They do not prove pagan origins.

If anything, they show that Christians were already celebrating the Nativity on December 25, and the pagans, threatened by the growing Christian population, were trying to create a competing festival.

Most modern scholars now agree that the pagan “Natalis Invicti” entry was likely a late pagan attempt to imitate or rival Christmas, not the other way around.

And notably:
The fiercest pagan critics of Christianity, Celsus, Porphyry, Julian the Apostate, never accused Christians of copying pagan festivals.

These men studied Christianity with obsessive scrutiny, attacking everything they could find, yet not once did they claim that Christmas was borrowed from paganism.

If the Church had copied a pagan holiday, these critics would have shouted it from the rooftops.
Their silence is deafening.

The Enlightenment: Where the Modern Myth Begins
The idea that Christianity borrowed from pagan solar worship only appears in the late 1700s, specifically in the writings of Charles-François Dupuis, who claimed that every religion was simply an allegory of the Sun’s movements.

His theory, imaginative but historically baseless, became popular among skeptics in later centuries and continues to be repeated today, despite being thoroughly discredited by serious historians.

The Truth: December 25th Is a Testimony to the Incarnation
Joseph and Mary did not travel to Bethlehem for a festival.
They obeyed an imperial census, an event firmly grounded in Roman administrative reality.

On December 25th, we do not celebrate astronomy, poetry, myth, or symbolism.
We celebrate history.
We celebrate the entrance of God into His creation.
We celebrate that moment when eternity stepped into time, when the Creator took on human flesh, when the Light of the world shone in the darkness, and the darkness could not overcome Him.

Christmas is not about the Sun being reborn.
It is about the Son of God entering the world He made.

​And so, with confidence, reverence, and joy, we proclaim:
Christ is born! Glorify Him!

The Church does not borrow its Light from the cosmos.
Rather, the cosmos borrows its light from Christ.