How Did Christianity Come About- Historical Development

Christianity's Jewish Roots

Christianity didn't appear out of nowhere. It grew from Judaism, a faith tradition that was already centuries old by the time Jesus was born around 4 BCE in Bethlehem.

Jewish people in first-century Palestine expected a Messiah—a deliverer who would free them from Roman occupation and restore Israel's kingdom. This expectation shaped everything that followed.

The Jewish scriptures (what Christians later called the Old Testament) contained prophecies that many believed pointed to this Messiah. The religious practices of the time—temple worship, Sabbath observance, dietary laws, and strict adherence to the Torah—formed the foundation Jesus would later challenge and transform.

The Life of Jesus of Nazareth

Jesus was a Jewish preacher who gathered followers in Galilee and Judea around 27-30 CE. His teachings emphasized love, forgiveness, and the coming Kingdom of God.

He drew crowds with parables, performed healings, and challenged the religious establishment. This put him at odds with both Roman authorities and Jewish leaders.

Roman governor Pontius Pilate sentenced Jesus to crucifixion around 30 CE. His followers believed he rose from the dead three days later—a claim that would become the central tenet of Christian faith.

Core Teachings Jesus Left Behind

• The Sermon on the Mount (love enemies, blessed are the poor, turn the other cheek)
• The Great Commandment: love God and love your neighbor as yourself
• Parables about the Kingdom of Heaven
• Emphasis on faith over ritual observance
• The Eucharist as a memorial of his death and resurrection

The Early Christian Movement (30-100 CE)

After Jesus's resurrection, his disciples (called apostles) spread his teachings throughout the Mediterranean world. They initially targeted Jewish communities, preaching that Jesus was the prophesied Messiah.

The movement grew through house churches—small gatherings in private homes rather than formal buildings. Early Christians shared meals, studied scriptures, and baptized new members.

Persecution by Roman authorities was sporadic but sometimes brutal. Emperor Nero blamed Christians for the Great Fire of Rome in 64 CE. This persecution, while terrible, actually strengthened the movement by creating martyrs who inspired further devotion.

The Jerusalem Council (49 CE)

The first major theological decision faced by Christians involved whether converts needed to follow Jewish law. The Jerusalem Council ruled that Gentiles could join without circumcision or full dietary compliance—a decision that opened Christianity to non-Jews worldwide.

This was the fracture point between Christianity and Judaism. From this moment, Christianity began its evolution into a separate religion rather than a Jewish sect.

St. Paul: The Apostle to the Gentiles

No single person shaped early Christianity more than Paul of Tarsus. Originally a persecutor of Christians, he experienced a dramatic conversion and became Christianity's greatest missionary.

Paul wrote extensive letters (epistles) to churches he founded or visited. These letters—Romans, 1 and 2 Corinthians, Galatians, Ephesians, Philippians, Colossians, 1 and 2 Thessalonians, 1 and 2 Timothy, Titus, and Philemon—became foundational Christian texts.

His theological contributions were massive:

• Justification by faith rather than by works of the law
• Christ's death as atonement for sin
• The church as the body of Christ
• The inclusion of Gentiles in God's covenant without Jewish law

Paul's letters predate the Gospels by 20-30 years, making them the earliest Christian writings in the New Testament.

The Writing of the Gospels

The four Gospels—Matthew, Mark, Luke, and John—were written between 70 and 100 CE. They tell the story of Jesus but from different perspectives and for different audiences.

Comparing the Gospels

Mark was likely the first Gospel written. Luke and Matthew used Mark as a source, along with a hypothetical collection of Jesus's sayings called Q. John was written last and differs significantly in style and content.

The Formation of the New Testament Canon

Early Christians had many writings circulating—gospels, letters, and apocalyptic texts. Not all were considered authoritative. The question of which texts were truly inspired took centuries to settle.

By the late second century, most churches accepted the four Gospels, Acts, Paul's letters, and a few others. Other texts like the Gospel of Thomas or Shepherd of Hermas were rejected as heretical or simply not authoritative enough.

Athanasius, Bishop of Alexandria, provided a definitive list of 27 books in 367 CE. Church councils in Hippo (393) and Carthage (397) confirmed this canon. These books became the New Testament.

Constantine and the Legalization of Christianity (313 CE)

The Edict of Milan, issued by Emperor Constantine and co-emperor Licinius, ended the persecution of Christians in the Roman Empire. Christianity went from an illegal sect to a tolerated religion overnight.

Constantine's patronage changed everything. He funded church construction, called the Council of Nicaea in 325 CE to resolve theological disputes, and reportedly converted on his deathbed.

By 380 CE, Emperor Theodosius I declared Christianity the state religion of Rome. What began as a persecuted minority was now the empire's official faith.

Major Schisms That Shaped Christianity

Christianity never remained unified. Theological disagreements and political tensions created lasting divisions.

The Great Schism (1054 CE)

The split between Eastern (Orthodox) and Western (Catholic) churches centered on issues of authority, the filioque clause (whether the Holy Spirit proceeds from the Father and Son or just the Father), and liturgical practices. The mutual excommunications of 1054 were never formally reversed, though recent dialogues have attempted reconciliation.

The Protestant Reformation (1517 CE)

Martin Luther's 95 Theses criticized Catholic practices, especially the sale of indulgences. This sparked a movement that questioned papal authority, salvation by works, and the structure of church governance.

Protestantism splintered into countless denominations: Lutheran, Reformed, Anglican, Baptist, Methodist, Pentecostal, and many others. Each interpreted scripture differently and emphasized distinct theological points.

How Christianity Spread Globally

Christianity's expansion followed European colonialism and missionary activity. By the 20th century, it had spread to every continent.

• 1st-3rd centuries: Mediterranean world, primarily through trade routes and missionary journeys
• 4th-7th centuries: Europe as the Roman Empire Christianized
• 8th-15th centuries: Celtic and Germanic peoples converted; Eastern Christianity spread to Russia
• 15th-19th centuries: Colonial expansion brought Christianity to the Americas, Africa, and Asia
• 20th-21st centuries: Rapid growth in sub-Saharan Africa, South America, and East Asia; decline in Europe

Today, Christianity is the world's largest religion with approximately 2.4 billion adherents, roughly 31% of the global population.

Key Takeaways

• Christianity emerged from first-century Judaism with Jesus as its founder
• The resurrection claim transformed a regional movement into a world religion
• Paul's missionary work and letters were crucial to early expansion
• The New Testament canon took 300 years to solidify
• Constantine's conversion changed Christianity from persecuted to privileged
• Schisms (1054, 1517) and colonialism shaped its current global form

Christianity's development wasn't inevitable or smooth. It involved power struggles, theological debates, political maneuvering, and genuine spiritual conviction. Understanding these origins clarifies why Christianity looks the way it does today—and why its various branches disagree on so much while sharing common roots.