Calling Mary the “Mother of God” makes a lot of Christians nervous.

It sounds like Catholics think a young woman from Nazareth gave birth to the Father, the Son, and the Holy Spirit.

Or that Mary existed before God.

Catholics do not believe either of those things.

But they do believe this:

The baby Mary held in her arms was God.

And once you say that, you have already said she is the Mother of God.

Wait… How Can God Have a Mother?

A lot of people hear the title and think:

“God is eternal. He has no beginning. Mary is a creature. She can be the mother of Jesus’ human nature, but not the Mother of God.”

And at first that sounds right.

God really does have no beginning.

Mary really is a creature.

But then you start reading a few passages and you have to stop for a second.

Because the question is not really about Mary at all.

It is about who Jesus is.

What Elizabeth Called Her

When Mary visits her cousin Elizabeth, Luke tells us Elizabeth “was filled with the Holy Ghost” (Luke 1:41).

And then she says:

“And whence is this to me, that the mother of my Lord should come to me?”
— Luke 1:43

Wait.

The mother of my Lord.

To a Jewish woman, “the Lord” was the name used in place of God’s holy name.

Elizabeth is filled with the Holy Spirit, and she calls the unborn child in Mary’s womb her Lord.

And she calls Mary His mother.

That is the Mother of God, in Elizabeth’s words.

The Angel Already Said It

A few verses earlier, the Angel Gabriel tells Mary about the child she will carry:

“The Holy which shall be born of thee shall be called the Son of God.”
— Luke 1:35

Born of thee.

Not “the human nature that will be born of thee.”

The Son of God Himself will be born of her.

Made of a Woman

St. Paul puts it this way:

“But when the fulness of the time was come, God sent his Son, made of a woman, made under the law.”
— Galatians 4:4

And St. John opens his Gospel with this:

“And the Word was made flesh, and dwelt among us.”
— John 1:14

Who was made flesh?

The Word.

And John already told us, “the Word was God” (John 1:1).

So God the Son took flesh.

And He took that flesh from Mary.

Isaiah Saw It Coming

Seven hundred years before Bethlehem, the prophet Isaiah wrote:

“Therefore the Lord himself shall give you a sign. Behold a virgin shall conceive, and bear a son, and his name shall be called Emmanuel.”
— Isaias 7:14

Emmanuel means “God with us” (Matthew 1:23).

Wait a second.

The virgin conceives.

The virgin bears a son.

And that son is God with us.

Isaiah just told you who Mary’s son is.

Mothers Are Mothers of Persons

Here is where it clicks for a lot of people.

Your mother did not create your soul.

God did.

She gave you your body.

But has your mother ever introduced you as “the mother of my son’s body”?

Hopefully not.

She says, “This is my son.”

Because mothers are mothers of persons, not just of bodies.

Now apply that to Jesus.

Jesus is one person.

That one person has two natures: fully God and fully human.

He is not a human person with God living inside Him.

He is God the Son, who became man.

So when Mary gave birth to Jesus, she did not give birth to a nature.

She gave birth to a Person.

And that Person is God.

So Mary is the Mother of God.

Then You Read the First Christians

Around A.D. 107, St. Ignatius of Antioch was on his way to Rome to be martyred.

In his letter to the Ephesians, he wrote that “our God, Jesus Christ,” was conceived in the womb by Mary.

Our God.

Conceived by Mary.

That is less than eighty years after the Resurrection.

And one of the oldest prayers to Mary we have, preserved on an Egyptian papyrus that many scholars date to the third century, calls her Theotokos.

That Greek word means “God-bearer.”

Christians were praying with that title long before anyone fought about it.

Then a Fight Breaks Out in A.D. 428

Around A.D. 428, a bishop of Constantinople named Nestorius started teaching that Mary should not be called Theotokos.

He said she should be called Christotokos, “Christ-bearer,” instead.

That sounds harmless.

But underneath it was a bigger problem.

Nestorius was splitting Jesus into two: a human Jesus born of Mary, and a divine Son joined to him.

That would mean the one who died on the Cross was not really God.

And if He was not God, He could not save us.

So in A.D. 431, the bishops of the Church gathered at the Council of Ephesus.

They declared that Mary is truly Theotokos, the Mother of God.

Ancient accounts say the people of Ephesus celebrated in the streets with torches that night.

Not because they wanted to make Mary into a goddess.

Because they had just protected the truth that Jesus is God.

This Is Not Just a Catholic Thing

Here is a surprise for a lot of people.

The Eastern Orthodox call Mary Theotokos in nearly every service.

Martin Luther called Mary the Mother of God.

So did John Calvin.

The Council of Ephesus is accepted by Catholics, Orthodox, and many Protestants alike.

For most of Christian history, this was simply what Christians said.

“But Doesn’t That Make Mary Older Than God?”

No.

The Son of God existed from all eternity.

Mary did not give Him His divinity.

She gave Him His humanity.

At a specific moment in history, the eternal Son entered time and took flesh in her womb.

She is not the source of His divine nature.

She is the mother of the Person who has that nature.

The Catechism says it simply: the One whom Mary conceived as man by the Holy Spirit, who truly became her Son, was the eternal Son of the Father, so the Church confesses that Mary is truly Mother of God (CCC 495).

Why It Matters

It is easy to treat this as a word game.

It is not.

If Mary is not the Mother of God, then the baby in the manger was not God.

And if He was not God in the manger, He was not God on the Cross.

And if He was not God on the Cross, our sins are still on us.

The title “Mother of God” is like a guard dog standing in front of the Incarnation.

It barks at anyone who tries to make Jesus less than God.

That is why the Church holds onto it.

It is a title about Mary that is really a confession about Jesus.

So What Is the Catholic Claim?

Here it is in simple terms.

Jesus is one Person, fully God and fully man.

Mary gave birth to that Person.

Elizabeth, filled with the Holy Spirit, called her “the mother of my Lord.”

St. Paul says God sent His Son, made of a woman.

St. Ignatius called Jesus “our God” conceived by Mary around A.D. 107.

And in A.D. 431, the Council of Ephesus defended the title Theotokos to protect the truth that Jesus is God.

So the real question is not:

“How can Catholics call Mary the Mother of God?”

The better question is:

“If Jesus is God, whose mother is she?”

Because once you say that the baby in Bethlehem was God, you have already answered the question.

Keep reading: What the Immaculate Conception Actually Means, or browse more questions in Catholicism Explained.

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Catholic Sources

Scripture (Douay-Rheims): Isaias 7:14; Matthew 1:23; Luke 1:31–43; John 1:1, 1:14; Galatians 4:4.

Catechism of the Catholic Church: CCC 466 (the Council of Ephesus); CCC 495 (Mary’s divine motherhood); CCC 509.

Early Christian writers and councils: St. Ignatius of Antioch, Letter to the Ephesians 18 (c. A.D. 107); the Sub Tuum Praesidium prayer (papyrus, often dated to the third century); Council of Ephesus (A.D. 431).

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