Christianity vs. Judaism: What Are the Key Differences?

Christianity and Other Religions — Part 4 of 12

Christianity’s relationship to Judaism is unlike its relationship to any other religion.

Jesus was Jewish.

His mother was Jewish.

His apostles were Jewish.

Abraham, Moses, David, Isaiah, Jeremiah, and the other prophets belong to the history Christians receive as their own sacred history. The Scriptures Jesus read are the writings Christians call the Old Testament.

Christianity did not begin by rejecting the God of Israel or Israel’s Scriptures.

It began with the proclamation that the God of Israel had fulfilled His promises through Jesus of Nazareth.

That is where Christianity vs. Judaism ultimately comes into focus.

Christians and Jews agree about many foundational realities, including one Creator God, the importance of the Hebrew Scriptures, God’s work through Abraham and Israel, the moral seriousness of sin, and God’s activity in history.

But they disagree about the question that changes everything:

Who is Jesus?

Historic Christianity confesses that Jesus is the promised Messiah, the eternal Son of God made flesh, the fulfillment of the Law and the Prophets, the final sacrifice for sin, and the risen Lord.

Judaism does not.

That divide is profound.

Part 4 of Our Christianity and Other Religions Series

In Part 1, we established the essential doctrines of historic orthodox Christianity.

In Part 2, we compared Christianity and Islam, focusing on their contradictory claims about Christ, the cross, revelation, and salvation.

In Part 3, we examined Christianity and Mormonism, showing why Mormonism is not another Christian denomination but a separate religious system with a different doctrine of God, Christ, revelation, and salvation.

Judaism requires a different kind of comparison.

Christianity does not view the Hebrew Scriptures as false revelation that Christianity replaced.

Jesus said:

“Do not think that I have come to abolish the Law or the Prophets; I have not come to abolish them but to fulfill them.”

—Matthew 5:17 (ESV)

The Christian claim is one of fulfillment.

The God who called Abraham, delivered Israel from Egypt, established His covenant, gave the Law, raised up David, and spoke through the prophets is the God Christians worship.

The disagreement is over what He has done in Jesus Christ.

Christianity and Judaism Begin With the God of Israel

Both Christianity and Judaism are uncompromisingly monotheistic.

The foundational confession of Israel declares:

“Hear, O Israel: The LORD our God, the LORD is one.”

—Deuteronomy 6:4 (ESV)

Jesus Himself affirmed this command (Mark 12:29).

Christians do not believe Jesus replaced the God of Israel or introduced another deity.

Christianity confesses the one God of Abraham, Isaac, and Jacob.

But Christians believe God’s later and fuller revelation makes something extraordinary clear:

The one God eternally exists as Father, Son, and Holy Spirit.

This is where Jewish and Christian understandings of God diverge.

Judaism rejects the Christian doctrine of the Trinity and does not confess Jesus as God the Son.

Christianity insists that confessing Jesus as divine does not abandon monotheism. Rather, Christians believe the identity of the one God is revealed more fully through Christ.

John writes:

“In the beginning was the Word, and the Word was with God, and the Word was God.”

—John 1:1 (ESV)

Then:

“And the Word became flesh and dwelt among us.”

—John 1:14 (ESV)

So the disagreement is not whether there is one God.

It is who the one God has revealed Himself to be.

The Central Question: Is Jesus the Messiah?

Both Christianity and Judaism possess a concept of Messiah, though Jewish understandings of the Messiah have varied across history and traditions.

The Hebrew word Mashiach means “anointed one.”

The Old Testament develops expectations surrounding God’s promises to Israel, including His covenant with David.

God promises David:

“Your house and your kingdom shall be made sure forever before me. Your throne shall be established forever.”

—2 Samuel 7:16 (ESV)

The prophets subsequently speak of a coming Davidic ruler.

Isaiah describes a shoot from the stump of Jesse upon whom the Spirit of the LORD rests (Isaiah 11:1–5).

Micah points toward a ruler coming from Bethlehem (Micah 5:2).

Jeremiah promises a “righteous Branch” for David who will reign as king (Jeremiah 23:5–6).

Christians believe these promises find their fulfillment in Jesus of Nazareth.

The New Testament begins by identifying Him accordingly:

“The book of the genealogy of Jesus Christ, the son of David, the son of Abraham.”

—Matthew 1:1 (ESV)

But most Jewish communities do not accept Jesus as the Messiah.

One major objection is straightforward: the Messianic age described by the prophets appears to involve worldwide peace, righteousness, restoration, and the visible reign of God’s chosen King.

The world clearly does not yet look that way.

Christianity answers this objection through what theologians often call the already and not yet of Christ’s kingdom.

Christ has already come as the suffering Savior.

He will come again as the victorious King.

His first coming accomplished redemption.

His second coming will bring His kingdom to its final, visible fulfillment.

This distinction is central to the Christian understanding of biblical prophecy.

The Messiah Was Also Promised as a Suffering Servant

Christianity does not believe the Old Testament only predicted a conquering king.

It also sees a pattern of suffering, rejection, sacrifice, and vindication that reaches its fulfillment in Christ.

Isaiah 53 is especially important.

The prophet describes a servant who is:

“pierced for our transgressions”

and:

“crushed for our iniquities.”

Isaiah continues:

“the LORD has laid on him the iniquity of us all.”

—Isaiah 53:5–6 (ESV)

Christians see this passage as pointing directly toward the saving work of Jesus.

The New Testament makes that connection explicitly.

Philip encounters an Ethiopian official reading Isaiah 53. When the man asks whom the prophet is describing, Acts tells us:

“Philip opened his mouth, and beginning with this Scripture he told him the good news about Jesus.”

—Acts 8:35 (ESV)

This is essential to understanding the Christian claim.

Jesus did not fail to be the Messiah because He suffered.

His suffering was part of His Messianic mission.

The crown and the cross are not competing identities.

The Messiah first suffers for sinners and then reigns in glory.

Psalm 22 and the Crucifixion

Psalm 22 also occupies an important place in Christian interpretation.

It begins:

“My God, my God, why have you forsaken me?”

—Psalm 22:1 (ESV)

Jesus speaks these words from the cross (Matthew 27:46).

The psalm describes mockery:

“He trusts in the LORD; let him deliver him.”

—Psalm 22:8 (ESV)

The Gospel accounts describe remarkably similar mockery directed at Jesus during His crucifixion (Matthew 27:41–43).

Psalm 22 also says:

“They divide my garments among them, and for my clothing they cast lots.”

—Psalm 22:18 (ESV)

John’s Gospel explicitly connects this to the soldiers dividing Jesus’ clothing at the crucifixion (John 19:23–24).

Christians therefore read Psalm 22 not as an isolated coincidence but as part of a larger biblical pattern culminating in Jesus.

The New Covenant Was Promised in the Hebrew Scriptures

Christianity’s claim to a new covenant did not originate with an attempt to discard the Old Testament.

The phrase itself comes from the prophet Jeremiah.

God declares:

“Behold, the days are coming, declares the LORD, when I will make a new covenant with the house of Israel and the house of Judah.”

—Jeremiah 31:31 (ESV)

This new covenant would involve something extraordinary:

“I will put my law within them, and I will write it on their hearts.”

And:

“I will forgive their iniquity, and I will remember their sin no more.”

—Jeremiah 31:33–34 (ESV)

At the Last Supper, Jesus takes the cup and says:

“This cup that is poured out for you is the new covenant in my blood.”

—Luke 22:20 (ESV)

Christianity therefore claims that the promised new covenant has been inaugurated through the death of Jesus.

The idea is not that Christians invented a new religion and happened to borrow Jewish language.

The Christian claim is much stronger:

What Israel’s prophets promised, God has accomplished through Israel’s Messiah.

The Temple and Sacrifice Raise an Important Question

The Hebrew Scriptures repeatedly emphasize sacrifice and atonement.

Leviticus 17:11 says:

“For the life of the flesh is in the blood, and I have given it for you on the altar to make atonement for your souls.”

The sacrificial system demonstrated something Christianity continues to proclaim:

Sin is serious, and reconciliation with a holy God is costly.

The Jerusalem temple was destroyed by the Romans in AD 70.

Since then, Judaism has continued without the temple sacrifices prescribed in the Torah, with Jewish religious life developing around practices including prayer, repentance, Torah observance, synagogue worship, and acts of righteousness.

Christianity gives a radically different explanation for why the old sacrificial system is no longer necessary.

The final sacrifice has already been offered.

John the Baptist sees Jesus and declares:

“Behold, the Lamb of God, who takes away the sin of the world!”

—John 1:29 (ESV)

Hebrews explains that animal sacrifices were never the final answer to human sin.

Christ:

“offered for all time a single sacrifice for sins.”

—Hebrews 10:12 (ESV)

For Christians, the disappearance of temple sacrifice does not leave a hole in God’s plan of redemption.

The sacrifices pointed beyond themselves.

They pointed to Christ.

Christianity Says the Entire Biblical Story Leads to Jesus

After His resurrection, Jesus meets two disciples traveling toward Emmaus.

They are confused.

They thought Jesus might be the promised Redeemer, but He had been crucified.

Jesus responds by taking them back to the Scriptures:

“And beginning with Moses and all the Prophets, he interpreted to them in all the Scriptures the things concerning himself.”

—Luke 24:27 (ESV)

Later He tells His disciples:

“Everything written about me in the Law of Moses and the Prophets and the Psalms must be fulfilled.”

—Luke 24:44 (ESV)

This explains how Christianity reads the Old Testament.

Not as a collection of disconnected predictions where Christians hunt for hidden references to Jesus in every verse.

Rather, the entire biblical story moves toward Him.

The promised offspring.

The Passover lamb.

The priesthood.

The sacrifices.

The Davidic king.

The suffering servant.

The new covenant.

The hope of resurrection.

The kingdom of God.

Christians believe these themes converge in Jesus.

The Resurrection Is the Christian Claim Judaism Must Ultimately Confront

Christianity does not merely argue that certain Old Testament passages sound like Jesus.

The apostles grounded their proclamation in an event they claimed actually happened:

Jesus rose from the dead.

Peter’s sermon at Pentecost is profoundly Jewish.

He quotes Israel’s Scriptures and argues that David’s words ultimately point beyond David himself.

Peter then declares:

“This Jesus God raised up, and of that we all are witnesses.”

—Acts 2:32 (ESV)

This is where the question becomes unavoidable.

If Jesus remained dead, Christian claims about Him collapse.

Paul says exactly that:

“If Christ has not been raised, your faith is futile and you are still in your sins.”

—1 Corinthians 15:17 (ESV)

But if Jesus truly rose bodily from the dead, His identity cannot simply be dismissed.

The resurrection vindicates His claims and confirms Him as the Messiah and Lord proclaimed by the apostles.

Christianity therefore stands or falls not merely on competing interpretations of ancient texts but on the historical reality of the crucified and risen Christ.

How Is a Person Made Right With God?

Here we reach another major difference between Christianity and Judaism.

Judaism is diverse, and it would be inaccurate to reduce Jewish theology to “earning heaven through good works.”

Jewish traditions commonly emphasize repentance, God’s mercy, covenant faithfulness, prayer, obedience, and righteous living in ways that cannot be summarized by a simplistic merit system.

Christianity nevertheless makes a distinct claim about the human condition.

Our problem is not merely that we occasionally disobey God’s commandments.

We are sinners who cannot justify ourselves before a holy God.

Paul—a Jewish Pharisee before becoming an apostle of Christ—writes:

“For by works of the law no human being will be justified in his sight.”

—Romans 3:20 (ESV)

He continues:

“For we hold that one is justified by faith apart from works of the law.”

—Romans 3:28 (ESV)

And this salvation is grounded in Jesus Christ.

The gospel does not announce that Gentiles discovered a way around obedience to Israel’s God.

It announces that Israel’s God has provided salvation for Jews and Gentiles through Israel’s Messiah.

Paul writes:

“For I am not ashamed of the gospel, for it is the power of God for salvation to everyone who believes, to the Jew first and also to the Greek.”

—Romans 1:16 (ESV)

Christianity vs. Judaism at a Glance

God

Christianity: The one God of Israel eternally exists as Father, Son, and Holy Spirit.

Judaism: One God; the Trinity is rejected.

Jesus

Christianity: The promised Messiah, eternal Son of God, and Lord.

Judaism: Jesus is not accepted as the divine Messiah.

Messiah

Christianity: Jesus inaugurated His kingdom in His first coming and will consummate it when He returns.

Judaism: The promised Messianic fulfillment is still awaited in traditions that maintain a personal Messianic expectation.

Scripture

Christianity: Receives the Old Testament as God’s Word alongside the New Testament.

Judaism: Receives the Hebrew Bible, or Tanakh, but not the New Testament as Scripture.

Sacrifice and Atonement

Christianity: The Old Testament sacrifices culminate in Christ’s once-for-all sacrifice.

Judaism: Contemporary Jewish life continues without temple sacrifice, emphasizing practices including repentance, prayer, Torah, and righteous deeds.

New Covenant

Christianity: Jeremiah’s promised new covenant has been inaugurated through Jesus’ blood.

Judaism: Does not accept the New Testament claim that Jesus established this covenant through His death.

Salvation

Christianity: Sinners are justified by God’s grace through faith in Jesus Christ, not through works of the law.

Judaism: Views of salvation and the world to come vary among Jewish traditions; Christianity rejects any hope of reconciliation with God apart from Christ.

The differences are substantial.

But they occur within a uniquely shared biblical history.

Did Christianity Replace Israel?

This question requires care.

Christians have sometimes spoken about Judaism and Jewish people in arrogant, dismissive, or even hateful ways.

That is indefensible.

The apostle Paul gives Gentile Christians the opposite warning.

Speaking of God’s covenantal purposes, he tells Gentile believers:

“Do not be arrogant toward the branches.”

—Romans 11:18 (ESV)

Paul himself was Jewish.

Jesus’ apostles were Jewish.

The first Christians were Jewish.

The gospel went “to the Jew first” (Romans 1:16).

Christians therefore have no biblical basis for contempt toward Jewish people.

At the same time, avoiding arrogance does not require abandoning the Christian claim.

The New Testament unequivocally teaches that God’s saving promises reach their fulfillment in Jesus Christ.

Paul writes:

“For all the promises of God find their Yes in him.”

—2 Corinthians 1:20 (ESV)

The Church does not have permission to despise Israel.

Nor does it have permission to preach salvation apart from Israel’s Messiah.

Is Christianity Just a Gentile Corruption of Judaism?

Historically, Christianity eventually became overwhelmingly Gentile.

But its origins are unmistakably Jewish.

Jesus’ earliest followers did not conclude that He was Messiah because Greek or Roman religion taught them to expect Him.

They reached that conclusion while reading Israel’s Scriptures and witnessing what they believed God had accomplished through Jesus.

Peter.

John.

James.

Paul.

The earliest Christian proclamation emerged from Jews convinced that Israel’s Messiah had come.

The first major theological dispute within Christianity was not whether Jews could enter a Gentile religion.

It was essentially the opposite:

Could Gentiles enter God’s people through Christ without first becoming Jewish?

Acts 15 records that controversy.

Christianity’s Jewish roots are therefore not a later addition.

They are built into its foundation.

The Question Is Not “Christianity or the Old Testament?”

Sometimes Christianity and Judaism are framed as though Jews follow the Old Testament while Christians follow the New Testament.

That is misleading.

Christians believe both.

Jesus says the Old Testament Scriptures testify about Him (John 5:39).

The Christian question is therefore not:

Should we believe Moses and the prophets, or should we believe Jesus?

It is:

Do Moses and the prophets ultimately point us to Jesus?

Christianity answers yes.

Jesus told His opponents:

“If you believed Moses, you would believe me; for he wrote of me.”

—John 5:46 (ESV)

That is an enormous claim.

Jesus does not position Himself against Israel’s Scriptures.

He claims to be their fulfillment.

The Divide Ultimately Comes Down to Christ

Christianity and Judaism share a history no other two religions share.

Christians read Genesis.

Christians read Exodus.

Christians sing the Psalms.

Christians read Isaiah.

Christians confess the God who called Abraham, spoke through Moses, established David’s throne, and promised a new covenant through Jeremiah.

But Christianity insists that the story cannot stop there.

The promises move toward Christ.

The sacrificial system moves toward Christ.

The Davidic covenant moves toward Christ.

The suffering servant moves toward Christ.

The promise of forgiveness moves toward Christ.

And the hope of resurrection moves toward Christ.

The deepest disagreement between Christianity and Judaism is therefore not about food laws, calendars, cultural customs, or even religious history.

It is about Jesus of Nazareth.

Was He merely a Jewish teacher whose followers later made extraordinary claims about Him?

Or is He the Messiah Israel was promised, the eternal Son made flesh, the Lamb of God who bears sin, and the risen Lord?

Historic Christianity gives an unambiguous answer.

Jesus is the Christ.

Peter confesses:

“You are the Christ, the Son of the living God.”

—Matthew 16:16 (ESV)

And Jesus does not rebuke him.

He blesses him.

For Christians, this confession cannot be optional.

Christians Should Love Jewish People Without Compromising the Gospel

There is no contradiction between genuine love for Jewish people and the Christian conviction that they, like every other human being, need Christ.

Christians must reject antisemitism, ethnic hostility, mockery, and contempt.

Jewish people are not uniquely guilty before God.

All humanity is guilty.

“All have sinned and fall short of the glory of God.”

—Romans 3:23 (ESV)

And the gospel is offered to all.

There is not one way of salvation for Gentiles and another way for Jews.

Peter said of Jesus:

“And there is salvation in no one else.”

—Acts 4:12 (ESV)

That claim applies universally.

To the religious and irreligious.

To Jew and Gentile.

To every nation, tribe, language, and people.

Christians therefore should not treat Jewish evangelism as hostility.

If Jesus truly is the Messiah, then telling someone about Him is an act of love.

Why This Matters for the Local Church

This comparison is not merely an academic exercise in comparative religion.

It should deepen the way Christians read Scripture.

The Old Testament is not background material Christians can safely ignore.

Without Abraham, Moses, David, the prophets, the covenants, the priesthood, the sacrifices, and the promises, we will misunderstand the gospel.

Faithful churches should teach the whole counsel of God.

They should show believers how the Old and New Testaments fit together.

They should proclaim Christ from all of Scripture without forcing Him artificially into every verse.

They should teach Christians to reject antisemitism while also refusing to compromise the exclusive claims of Jesus.

And they should form believers who understand that Christianity is not detached from Israel’s story.

It is the proclamation that Israel’s Messiah has come.

We need churches where Scripture is read as one unfolding story of redemption.

We need pastors who teach both Testaments faithfully.

We need gathered worship shaped by the truth of the Triune God.

We need discipleship that roots us in the whole Bible.

And we need Christian communities that proclaim Jesus as Messiah, Lord, and Savior with both courage and love.

Coming Next: Christianity vs. Hinduism

Part 5 of our Christianity and Other Religions series will move into a very different religious worldview:

Christianity vs. Hinduism.

The contrasts are substantial.

Is there one eternal Creator who is distinct from creation?

Or is ultimate reality understood in ways that can include many gods, manifestations of the divine, or an impersonal absolute?

Does a person live once and then face judgment?

Or do human beings pass through repeated cycles of reincarnation shaped by karma?

Is humanity’s deepest problem sin before a holy God?

Or ignorance, attachment, or bondage to the cycle of rebirth?

And is salvation found in the finished work of Jesus Christ—or through paths aimed at liberation?

That is where we will turn next.

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