What are the main branches and denominations of Christianity?

One Faith, Many Expressions

When the church began at Pentecost, there was one community of believers with one message and one Lord. So how did Christianity become the vast, diverse family of traditions we see today — Roman Catholic, Eastern Orthodox, Lutheran, Baptist, Pentecostal, and thousands more?

The answer is not simply human failure, though division is never something to celebrate. It is also the story of the gospel taking root in every culture and language, of honest theological disagreements being worked through over centuries, and of God's church proving remarkably resilient through every era and empire.

The interactive diagram above maps the major branches. Click any node to learn about that tradition's history, beliefs, and size.

The First Great Split: East and West (1054 AD)

For the first thousand years, the church was broadly unified under five great centres: Rome, Constantinople, Alexandria, Antioch, and Jerusalem. Tensions between Rome (Latin, Western) and Constantinople (Greek, Eastern) had been building for centuries over theology, politics, and authority. In 1054 AD, Pope Leo IX and Patriarch Michael Cerularius mutually excommunicated each other — the Great Schism — splitting Christianity into Roman Catholicism and Eastern Orthodoxy.

The key disputes: papal authority (Rome claimed universal jurisdiction; Constantinople rejected it), the filioque clause (whether the Holy Spirit proceeds from the Father alone, or from the Father and the Son), and liturgical differences. The mutual excommunications were only formally lifted in 1964.

The Second Great Split: The Protestant Reformation (1517 AD)

When Martin Luther nailed his 95 Theses to the door of the Wittenberg church on October 31, 1517, he was protesting the sale of indulgences — but the movement he ignited reshaped Western Christianity permanently. Luther's core convictions became the five "solas" of the Reformation:

• Sola Scriptura — Scripture alone is the supreme authority
• Sola Fide — Justification is by faith alone
• Sola Gratia — Salvation is by grace alone
• Solus Christus — Christ alone is mediator
• Soli Deo Gloria — To God alone be the glory

From Luther's Reformation grew the Lutheran, Reformed, Anabaptist, and Anglican traditions — each emphasising different aspects of the Reformation's recovery of Scripture. From these, further movements multiplied: Presbyterians, Congregationalists, Baptists, Methodists, Holiness churches, and Pentecostals.

Earlier Splits: Nestorian and Coptic (431 and 451 AD)

Two ancient splits predate the Great Schism and the Reformation. At the Council of Ephesus (431 AD), the church condemned Nestorius, whose followers formed the Church of the East, spreading Christianity as far east as China. At the Council of Chalcedon (451 AD), the church defined Christ as having two complete natures (divine and human) in one person — a definition the Coptic, Ethiopian, and Armenian churches rejected, forming the Oriental Orthodox tradition. These are among the oldest continuous Christian communities in existence.

Should Denominations Exist?

The existence of denominations is a source of pain for many Christians who take seriously Jesus' prayer "that they may be one" (John 17:21). And the pain is legitimate — division within the body of Christ is a scandal before a watching world.

At the same time, it is worth noting what most of these traditions agree on: the authority of Scripture, the Trinity, the full deity and humanity of Christ, salvation through his death and resurrection, the necessity of faith, and the return of Christ. The differences, while real, are often secondary to this shared core.

The Reformation was not primarily about splitting the church — it was about recovering the gospel. And from Luther's famous cry — "Here I stand; I can do no other" — came a rediscovery of grace that changed millions of lives.

What All Christians Share

The Apostles' Creed and the Nicene Creed (325 AD) express the non-negotiable core of Christian faith that unites every tradition in this tree:

• One God — Father, Son, and Holy Spirit
• Jesus Christ — fully God and fully human, born of the Virgin Mary
• His death on the cross for our sins
• His bodily resurrection on the third day
• His ascension and future return to judge the living and the dead
• The forgiveness of sins and the life everlasting

On these foundations, every branch of the tree in the diagram above stands together. The diversity is real — and sometimes painful — but so is the unity. One Lord, one faith, one baptism (Ephesians 4:5).

For further reading, The Gospel Coalition's quick guide to Christian denominations is an excellent resource: Quick Guide to Christian Denominations.