Today, Judaism and Christianity are recognised as two distinct major world religions, each with its own identity, traditions, holy scriptures and history of development. However, the question of when and why the two parted ways is not as straightforward as is often imagined. For centuries, many people have assumed that the split occurred immediately after the death and resurrection of Jesus or following the destruction of the Temple in Jerusalem in 70 AD. However, modern research suggests that the process was far more complex, protracted and gradual than has previously been understood.

 

Post-Exilic Judaism: The Common Heritage of Jews and Christians

To understand the origins of Christianity, one must first understand the context of Judaism following the Babylonian Exile. After the Israelites returned to their land in the time of Ezra and Nehemiah, they rebuilt the Temple and re-established a religious life centred on the Torah. Scholars refer to this period as the era of Second Temple Judaism (Second Temple Judaism).

 

Contrary to the image that often springs to mind for many people, Judaism at that time was not a uniform religion. It comprised various groups, sects and movements that coexisted. These included the Pharisees, the Sadducees, the Essenes, the Qumran community, the Samaritans, apocalyptic groups, and the followers of Jesus, who later became known as Christianoi in Greek or Notzrim in the Hebrew tradition.

 

Although diverse, all these groups remained under the broad umbrella of Judaism. They were united by a number of fundamental elements that formed the pillars of their shared identity. These pillars include the awareness of being God’s chosen people, belief in one God, a covenant relationship with God embodied through the Torah, and a connection to the Promised Land with the Temple as the centre of religious life. As long as these pillars remain the common ground, the various different groups can continue to exist as part of the same Judaism.

 

The Classical View and Criticisms of It

For a long time, scholars understood the relationship between Judaism and Christianity through a simple model. According to the classical view, Judaism was the parent religion, whilst Christianity was a sect that emerged from within it. After Jesus’ resurrection, or at the latest by the year 70 AD, the two groups were considered to have parted ways almost immediately, becoming two distinct religions.

 

This view gave rise to two major consequences. On the Christian side, the belief developed that the Church is the ‘New Israel’, replacing Israel as God’s chosen people. This view is known as supersessionism, namely the idea that the Church has taken Israel’s place in God’s plan of salvation. Conversely, from a Jewish perspective, Christianity is often viewed as a heretical movement that has strayed from Judaism. In a number of later rabbinic traditions, Jesus is even referred to as “the deceiver”.

 

However, modern research suggests that this model is too simplistic. Neither Judaism nor Christianity in the first century had yet taken on a single, standardised form. Both were still in the process of forming a dynamic identity. Consequently, an increasing number of scholars view the relationship between Judaism and Christianity not as one of parent and child, but rather as two movements that developed from the same historical roots.

 

Various Metaphors for Understanding the Separation

Due to the complexity of the process of Jewish–Christian separation, scholars employ various metaphors to explain how two communities rooted in the same tradition eventually evolved into distinct identities. Interestingly, not all metaphors emphasise separation. Some highlight the widening gap between the two, whilst others emphasise their shared origins and the enduring connections that remain. This diversity of metaphors demonstrates that, to this day, scholars continue to debate the best way to understand the relationship between Judaism and Christianity in their early stages.

 

Parting of the Ways

The most famous metaphor is the parting of the ways or “separating paths”, which was popularised by James D.G. Dunn and Geza Vermes. According to this model, Judaism and Christianity initially followed the same path, but gradually took different directions.

 

The use of the plural form (ways) is crucial. This term indicates that neither Judaism nor Christianity was ever a completely homogeneous group. Both consist of diverse sects and traditions that are in the process of shaping their own identities. Consequently, this separation did not occur all at once, but took place gradually and varied according to location and historical context.

 

Two Twins from the Same Womb

Alan Segal and Gabriele Boccaccini proposed a kinship model to explain the relationship between Judaism and Christianity. They compared it to Esau and Jacob, the twin sons born to Rebekah.

 

This metaphor rejects the view that Christianity is merely a “offspring” of Judaism. Rather, both Rabbinic Judaism and Christianity are viewed as two forms of Judaism that developed from the same source following the great crisis caused by the destruction of the Temple in 70 CE. Both were born of the same “mother” and both sought to inherit the identity of the people of God, although they subsequently took different paths.

 

Two Dialects of One Language

Jewish academic and historian Daniel Boyarin uses a linguistic metaphor to describe the relationship between Judaism and Christianity. According to him, the two can be understood as two dialects that have developed from the same language.

 

In the early stages, the two communities shared many similar concepts, symbols and theological language. The differences that subsequently emerged did not occur suddenly, but rather through a lengthy process. Just as two dialects gradually develop into distinct languages, so too did Judaism and Christianity form their own respective identities whilst retaining a number of elements derived from their shared heritage.

 

The Widening Rift

Another metaphor is put forward by Craig A. Evans, who describes the relationship between Judaism and Christianity as a “rift” (rift). In his view, the rift began to emerge when the followers of Jesus developed two characteristics that increasingly distinguished them from mainstream Judaism.

 

Firstly, the recognition that Jesus was the Messiah promised by God. Secondly, the acceptance of non-Jews as members of God’s people without first having to become Jewish. These two developments gradually created an ever-widening gap between the community of Jesus’ followers and other Jewish groups. Consequently, a number of other scholars continue to use terms such as schism, split or separation to describe this process of separation.

 

Different, but Still Connected

Some scholars use metaphors drawn from nature to emphasise that, although Judaism and Christianity have developed into two distinct traditions, they still share a deep connection.

 

Tobias Nicklas, for example, compares the two to two bushes or shrubs that appear separate on the surface, but whose rootsremain close together and intertwined beneath the ground. This image emphasises the existence of a shared historical and theological foundation. Meanwhile, the French scholar Jean-Marc Blanchetière, referring to Romans 11, uses the metaphor of a tree and its roots. In his view, Christianity can be understood as a tree growing from the roots of Judaism. Consequently, Christianity must continue to draw upon those roots in understanding its identity and theology, whilst Judaism does not depend on Christianity to explain its existence.

 

Another metaphor was put forward by Morton Smith, who compared Judaism and Christianity to two mountains: Mount Sinai, symbolising Judaism, and the heavenly Mount Zion, symbolising Christianity. However, Smith’s focus was not primarily on the two mountains themselves, but rather on the valleys thatbetween them. According to him, it is in this ‘in-between’ space that various connections, influences and points of contact exist, which have continuously linked the two traditions throughout history.

 

A Cloth That Is Slowly Tearing

In addition to the metaphor of diverging paths, James D.G. Dunn also uses the image of a woven fabric to explain the relationship between Judaism and Christianity. Initially, both were part of the same weave. However, various historical, social, political and theological pressures caused the threads to gradually loosen and come apart.

 

Ultimately, the fabric tore into two distinct parts. This metaphor emphasises that the separation of Judaism and Christianity was not the result of a single decision or a specific event, but rather the consequence of a long process spanning several centuries.

 

These various metaphors demonstrate that no single model is capable of explaining the full complexity of the relationship between Judaism and Christianity. Some metaphors emphasise the separation, others highlight aorigins, whilst others suggest that the relationship between the two has never been entirely severed. Consequently, much contemporary research tends to view the separation of Judaism and Christianity not as a single event, but as a long, gradual historical process that unfolded differently in various places.

 

When Did the Separation Begin?

To date, there is no consensus on exactly when the process of separation began.

 

Some scholars point to the historical Jesus around the 30s AD. According to this view, the conflict between Jesus and some Jewish religious leaders, which culminated in his crucifixion, marked the beginning of tensions that subsequently developed into a schism. Jesus’ claims regarding His relationship with the Father, His authority to interpret the Torah, and His attitude towards the Sabbath and the Temple are often seen as factors that gave rise to these tensions.

 

Another group points to Paul and his mission to the Gentiles in the 50s AD. Paul’s success in bringing non-Jews into the community of God’s people without requiring them to become Jews first is regarded as one of the key turning points in the process of separation.

 

Some also observe that the seeds of separation were already evident in New Testament texts written between 70 and 100 CE. Matthew 23 contains a harsh condemnation of the Pharisees. Matthew 27:25 records the crowd’s cry concerning Jesus’ blood. John 8:44 uses very sharp language against Jesus’ opponents. Meanwhile, the Acts of the Apostles describes recurring conflicts between Paul and a number of Jewish communities.

 

Nevertheless, many scholars argue that up until 70 CE, the followers of Jesus could still be understood as one variant within a diverse Judaism. Consequently, the year 70 CE is often regarded as a more significant turning point.

 

The year 70 CE and the Destruction of the Temple

The destruction of the Temple by the Roman army in 70 CE was one of the most defining events in Jewish history. For centuries, the Temple had been the centre of worship, identity and religious life for the Jewish people. When that centre was destroyed, Judaism had to find new ways to survive.

 

It was in this context that the rabbis sought to redefine Jewish identity by placing the Torah and the synagogue at the centre of religious life. Tradition subsequently links this process to the group of rabbis at Yavneh led by Rabbi Yohanan ben Zakkai.

 

Meanwhile, the Christian community gradually developed the understanding that they themselves constituted the new eschatological Temple. Consequently, after 70 CE, they no longer regarded the Temple in Jerusalem as the centre of their religious life. This difference gradually created a rift between the two groups.

 

AD 135: The Beginning of a More Distinct Separation

Many modern scholars regard the year 135 AD, following the failure of the Bar Kokhba revolt against Rome, as a clearer turning point in the process of separation. Bar Kokhba sought to re-establish Jewish independence and restore the Temple. However, the Christians did not support the revolt. From that point onwards, it became increasingly clear that the two groups held differing visions regarding the future of God’s people.

 

During this period, the rabbis began to use the term ‘minim’ to refer to groups considered heretical, including Christians. Conversely, early Christian writers began to condemn Judaism as a doctrine that had been abandoned. Polemics arose from both sides.

 

Nevertheless, the relationship between the two had not yet been completely severed. The British historian Judith Lieu described this situation with an intriguing phrase: a criss-crossing of muddy tracks, muddy paths that still criss-cross one another. Right up until the fourth century, there were still many practices, traditions and communities that demonstrated the overlap between Judaism and Christianity.

 

Why Did They Part Ways?

Historical Factors

The two Jewish wars against Rome (66–70 CE and 132–136 CE) had an immense impact. The destruction of Jerusalem and the Temple permanently altered the face of Judaism.

 

According to the Roman historian Dio Cassius, the second revolt caused widespread destruction. Dozens of fortresses and hundreds of villages were destroyed, whilst hundreds of thousands of Jews lost their lives. Furthermore, Emperor Hadrian’s policies led to many Jews being expelled from Judea and replaced by non-Jewish settlers. As a result, the Christian community in Palestine became increasingly dominated by non-Jews.

 

Political Factors

Roman political policies also accelerated the process of separation. After 70 AD, Emperor Vespasian introduced the Fiscus Judaicus, a special tax on the Jews.

 

During the reign of Domitian, the scope of this tax was extended to include those associated with Judaism. However, Nerva subsequently restricted the obligation to those who actually practised Jewish customs. This situation prompted many Christians, particularly those of non-Jewish origin, to assert that they were not part of the Jewish community. Consequently, politically speaking, Rome began to regard Jews and Christians as two distinct entities.

 

Social Factors

In Judaism, identity is primarily determined by birth and ethnicity. A person is considered Jewish because they were born Jewish.

 

Conversely, the community of followers of Jesus has become increasingly open to other nations. Non-Jews were accepted as full members of God’s people without first having to become Jewish. This fundamental shift regarding who belonged to God’s people became one of the most significant social factors in the process of separation.

 

Theological Factors

Theological differences also became increasingly pronounced. Paul emphasised that God does not favour any particular ethnic group. Both Jews and non-Jews can be justified by God through faith in Jesus Christ. This understanding shifts the traditional boundaries that have hitherto defined God’s people on the basis of ethnic identity.

 

Pneumatological Factors

The concept of the Holy Spirit also plays an important role. In Jewish tradition, the Spirit of God is primarily understood as a gift to the people of the covenant. However, in the Acts of the Apostles and Paul’s epistles, the Holy Spirit is depicted as working amongst non-Jews as well. The presence of the Spirit amongst other nations is understood as a sign that they, too, are accepted by God.

 

Christological Factors

The most sensitive factor is the question of Jesus himself. The New Testament presents Jesus not merely as a prophet or teacher, but as the Messiah and Lord who has a unique relationship with God.

 

Texts such as Philippians 2:5–11, John 10:30, John 20:28, and 1 Corinthians 8:6 show that the early Christian community accorded Jesus the highest honour. In worship, prayer, hymns and the creed, Jesus received a level of honour which, for many Jewish rabbis, was deemed appropriate only for God.

 

As Jewish monotheism was highly sensitive to any form of worship other than that of YHWH, Christian veneration of Jesus was viewed as resembling the deification of the Roman emperor, which was also vehemently rejected by the rabbis. It is not surprising that the development of Christology became one of the factors that accelerated the separation between Jews and Christians.

 

Conclusion: A Long and Gradual Parting

Contemporary studies increasingly show that the separation between Judaism and Christianity was not an event that occurred in a single day, a single year, or even a single generation. This separation was a long process that began in the first century and only took on a relatively clear form in the fourth century, when Christianity gained political support from the Roman Empire and Rabbinic Judaism became increasingly accepted as the normative form of Judaism.

 

Thus, the history of Jewish–Christian relations cannot be understood as a simple story of one religion giving rise to another. It is more accurate to view them as two communities born of the same historical roots, growing up in the same environment, influencing one another, debating with one another, and gradually forming their respective identities.

 

This historical awareness is important not only for understanding the past, but also for building healthier relations between Jews and Christians in the present day. If both were once part of the same family, then the history of their separation should not be a reason to harbour hostility, but rather an opportunity to understand the shared roots that have shaped the journey of both faiths over the centuries.