The Great Divergence
Why Christianity is the True Continuation of Ancient Israel
In modern religious dialogue, there is a prevailing assumption that contemporary Judaism is the “original” religion and Christianity is the “spin-off.” The narrative usually suggests that for thousands of years, there was a monolithic religion called “Judaism.” Then, in the first century, a group of heretics broke away to start something entirely new called “Christianity.”
This framework is historically and theologically flawed.
The reality is that the religion practiced by Moses, David, and Elijah finds its organic, intended continuation not in the synagogue of the 21st century, but in the Church. Christianity is not a new invention; it is the realization of the Old Testament faith. Conversely, modern Rabbinic Judaism is a reconstruction—a completely new system built from the ashes of AD 70 to survive without a Temple, fundamentally changing the nature of the covenant.
To understand why Christianity is the true heir of ancient Israel, we must look at the fractured landscape of the first century, the cataclysmic destruction of the Temple, and the theological definition of the “True Israel.”
The Myth of a Monolithic Judaism
To understand the split, we first must debunk the idea that first-century Judaism was a single, unified religion. When Jesus walked the earth, there was no such thing as “Normative Judaism.” Instead, there were “Judaisms”—competing sects all claiming to be the true guardians of the Torah.1
The Sadducees controlled the Temple and the priesthood. They rejected oral tradition and the afterlife, focusing strictly on the rituals of the Law. On the other side were the Pharisees, the populists who obsessed over the “Oral Law” and traditions, believing these oral traditions were as binding as the written Torah. Meanwhile, the Essenes were ascetics who believed the Temple priesthood was corrupt; they withdrew to the desert to await the Messiah. There were also the Zealots, revolutionaries who thought the Kingdom of God would come through the violent overthrow of Rome.
Finally, there was “The Way,” composed of Jews who believed that the prophecies of the Law and Prophets were fulfilled in Jesus of Nazareth. When Jesus debated the religious leaders, He wasn’t rejecting the Old Testament; He was rejecting the accretions of men that had obscured it. In Mark 7:8, He tells the Pharisees, “You leave the commandment of God and hold to the tradition of men.”
The early Christians did not view themselves as converts to a new religion. They viewed themselves as the faithful remnant of Israel who had recognized their King. The split was not between “Judaism and Christianity,” but between those who accepted the fulfillment of the prophecies and those who rejected Him to maintain their own traditions.
The Prophetic Pivot
The definitive break between these paths occurred in AD 70 with the Roman destruction of Jerusalem and the Second Temple. More than just a historical tragedy, this event was a theological and prophetic fulfillment that forced a definitive split.
The Prophetic Framework: Dual Fulfillment
To understand AD 70, we must understand how Jesus and the Apostles viewed prophecy. They operated on a framework of Dual Fulfillment—the idea that prophecy often has a “near” fulfillment in history and a “far” fulfillment at the end of time.
In the Olivet Discourse (Matthew 24), Jesus predicts the destruction of the Temple with chilling accuracy, declaring that “not one stone here will be left on another.” This was the near fulfillment—a judgment on the generation that rejected Him and the tangible end of the Old Covenant age. However, Jesus seamlessly weaves this event with descriptions of the Final Judgment, which serves as the far fulfillment. The destruction of Jerusalem served as a historical “type” or shadow of the ultimate end of the world.
This tension between the “already” and the “not yet” is central to Christian theology. As Paul notes in 2 Thessalonians 2, the “mystery of lawlessness” was already at work in the first century, even as we await the final defeat of evil.
The Theological Crisis
When the Temple fell in AD 70, the religion of the Old Testament—which was strictly Temple-centric—faced an existential crisis. The Law of Moses required a priesthood, an altar, and blood sacrifice. Leviticus 17:11 is clear: “For the life of the flesh is in the blood... it is the blood that makes atonement for one’s life.”
Without the Temple, there could be no sacrifice. Without sacrifice, there could be no atonement under the Law. This reality forced a divergence into two distinct paths.
The first path, Christianity, looked at the smoking ruins of Jerusalem and saw confirmation. The book of Hebrews argues that the earthly Temple was merely a “shadow” of the true reality. Christ is the High Priest, the Altar, and the Lamb. Christianity did not abolish the OT system; it fulfilled it. It maintained the function of the Law—atonement through blood—by transferring it from the blood of bulls and goats to the blood of Christ.
The second path, Rabbinic Judaism, emerged from a void. The Pharisees, having rejected Jesus, could no longer maintain the Old Testament religion because the mechanism of atonement was gone. According to tradition, Rabbi Yohanan ben Zakkai established a center at Jamnia (Yavneh), where the Pharisees reinvented the faith. They declared that prayer, repentance, and the study of Torah would replace animal sacrifice. While this was a pragmatic necessity for survival, it was a fundamental theological shift. It transformed a religion of Grace through Atonement into a religion of Works through Study. This post-AD 70 “Rabbinic Judaism” is the ancestor of modern Judaism. It is not the religion of Moses; it is a reaction to the loss of the Mosaic system.
The Olive Tree
If Christianity is the true continuation, how do we explain the fact that the majority of ethnic Jews did not accept Jesus? The Apostle Paul anticipates this objection in his magnum opus, the Book of Romans.
In Romans 9-11, Paul dismantles the idea of “Replacement Theology” (that the Church replaced Israel) and replaces it with “Remnant Theology.” He writes, “For not all who are descended from Israel belong to Israel” (Romans 9:6).
Paul uses the metaphor of the Olive Tree in Romans 11 to explain the continuity of God’s grace. In this imagery, the root represents the Patriarchs (Abraham, Isaac, Jacob) and the Covenants. The natural branches are the people of Israel, while the wild shoots represent the Gentiles. Paul argues that unbelieving Jews were “broken off” the tree because they rejected the Messiah, while believing Gentiles were “grafted in” among the remaining branches.
Crucially, there is only one tree. The Church is not a new tree planted next to the old one. It is the ancient tree of Israel, pruned of unbelief and expanded to include the nations, just as God promised Abraham that in him all the families of the earth would be blessed. This implies that a Gentile Christian is arguably “more Jewish” in a spiritual sense than a secular or Rabbinic Jew, because the Christian is connected to the life-giving Root (the Messiah). The adherents of Rabbinic Judaism are attempting to maintain a branch that has been cut off from its source.
Geopolitics vs. Covenant
Finally, this framework challenges how we view the modern State of Israel established in 1948. While the re-establishment of a Jewish state is a significant historical event, we must be careful not to confuse a secular geopolitical entity with the covenantal “Israel of God” (Galatians 6:16). From the perspective of continuity, the prophecies of restoration found in the Old Testament were not primarily about a political return to a piece of land in the Middle East, but about a return to God through the Messiah.
First, the land acts as a type. Just as the Temple was a shadow of Christ, the “Promised Land” was often viewed by the New Testament writers as a shadow of a greater reality: the New Creation. In Romans 4:13, Paul expands the promise to Abraham, stating that he would be heir not just to Canaan but to the world.
Second, restoration requires repentance. The Old Testament prophets consistently linked return to the land with a return to obedience and faith, as seen in Deuteronomy 30. A political return without a spiritual return to their Messiah does not constitute the fulfillment of the “Restoration of Israel.”
Christians owe nothing to the modern state of Israel, as it is entirely distinct from the spiritual continuation of the true Israel. The “Restoration” the prophets longed for is found in the Church, where Jew and Gentile are united in the Messiah rather than a secular democracy. To conflate the two is to confuse the earthly shadow with the spiritual substance.
The True Religion Realized
The separation between Christianity and Judaism is not a separation between “New” and “Old.” It is a separation between Substance and Shadow.
Christianity is the Old Testament faith fully realized. It accepted the Messiah, internalized the Law, and recognized that the types and shadows of the Temple were meant to give way to the reality of Christ.
Modern Judaism, by contrast, is a tragic preservation of the shadow without the substance. In rejecting the Cornerstone, the builders had to construct a new building, one based on the Talmud and Rabbinic tradition rather than the Levitical system of atonement. Even the scriptures themselves bear the scars of this divergence. As we explored elsewhere, the Masoretic text used by modern Judaism reflects later editorial choices that often obscure the Messianic prophecies preserved in the Christian Septuagint.2
To be a true follower of the Old Testament is to embrace the One to whom it points. The Olive Tree still stands, and its Root is Christ. The invitation remains open for the “natural branches” to be grafted back in, joining the “true Israel” in the worship of their King.
The term “Judaisms” is widely used by scholars of the Second Temple period (notably Jacob Neusner) to describe the lack of a single orthodoxy before AD 70. The variety of beliefs regarding the Temple, the calendar, the canon of Scripture, and the nature of the Messiah was so vast that it is more accurate to speak of distinct religious systems sharing a common heritage rather than a single monolithic religion.