Christianity: beliefs, history, practices, and global influence

Core beliefs

Most Christian traditions affirm belief in one God (monotheism, the only God) who exists in a three‑person communion known as the Trinity: Father, Son and Holy Spirit. Central to Christian faith is the conviction that Jesus is the incarnate Son of God, both fully human and fully divine, born of the Virgin Mary, and in human terms associated with a family that included Joseph, traditionally portrayed as a carpenter (Joseph). Christians hold that Jesus lived a life of teaching and healing in first‑century Judea, was tried under Pontius Pilate, was executed by crucifixion, and that his death and suffering address human sin. The conviction that he was raised from the dead (resurrection), later ascended to Heaven, and will return (second coming) is central to Christian hope and eschatology.

Scripture and revelation

The canonical scriptures for most Christians are collected in the Bible, conventionally divided into an Old Testament (the Hebrew scriptures) and a New Testament. The first four books of the New Testament, the Gospels, narrate Jesus’ life, teaching, death and resurrection. Christians typically regard the Bible as sacred scripture and as a primary source for doctrine and moral teaching. Early Christian interpreters read passages in earlier prophetic writings as having anticipated a coming Savior, while also emphasizing Jesus as a teacher and moral exemplar who revealed the character of the Christian God. Comparative attention to other Abrahamic faiths such as Islam highlights shared themes and divergent claims about prophecy and revelation.

Worship, sacraments and communal life

Christian worship takes many forms but commonly includes prayer, reading of scripture, preaching, and communal rites. Two rites are especially widespread across traditions: baptism, which marks initiation into the Christian community, and the Eucharist (also called Communion or the Lord’s Supper), which commemorates Jesus’ words and actions at the Last Supper. Churches vary in their theological accounts of sacraments and in liturgical style, from highly formal sacramental liturgies to informal prayer meetings. Acts of charity, education and mission have long been integral to Christian communal life and witness (missionary work).

Historical development and global spread

Christianity began as a movement within Judaism (a Jewish sect) and spread through the Roman world and beyond. By the fourth century it became a dominant religion of the Roman Empire. Early state adoptions include Armenia under King Tiridates III and the Kingdom of Aksum. During the Middle Ages, much of Europe became Christianized (Christianized), while long‑standing Christian communities continued in the Middle East, North Africa and parts of India. From the era of the Age of Discovery, European expansion and colonization carried Christianity to the Americas, Africa and other regions, often accompanied by organized missionary effort (missionary work). Over centuries Christian doctrine, institutions and cultural forms evolved through councils, theological debate and local adaptation.

Denominations and diversity

Contemporary Christianity comprises a wide family of communions, denominations and movements. Major branches commonly named are Roman Catholicism, Eastern Orthodoxy and Protestantism, though many other traditions exist (including Anglican, Oriental Orthodox and numerous independent churches). Differences among these groups involve questions of authority, ecclesial structure, liturgy, sacramental theology and interpretation of scripture. Despite diversity, many Christians share core convictions about Jesus, the authority of scripture and the importance of communal worship and moral life. The history of Christianity also includes reform movements and periodic efforts at ecumenical dialogue aimed at greater unity.

Social and cultural influence

Christianity has been a major influence on art, music, education, law and social services in many societies. Churches and Christian organizations have founded hospitals, schools and charitable agencies that continue to serve diverse communities. Christian festivals and the liturgical calendar shape public life in many countries; Christian ethical teachings inform debates on social issues. In the contemporary world, Christians engage with challenges such as secularization, pluralism and questions about the role of religion in public life, while also participating in global conversations on human rights, ecology and social justice.

Demographics and contemporary presence

As a global religion, Christianity is present in virtually every region of the world. Modern estimates place Christian populations in the billions; exact figures vary by source and method of counting but the religion remains one of the largest worldwide (modern statistics). Christian communities today are marked by cultural diversity, varied theological emphases and different patterns of institutional life.

Further reading and related topics

• Christians
• Jesus Christ
• Trinity
• Monotheism
• Concept of one God
• Judaism
• Judea
• Incarnation and mission
• Joseph
• Crucifixion
• Pontius Pilate
• New Testament
• Bible
• Sacred scripture
• Gospels
• Atonement
• Sin
• Resurrection
• Ascension
• Heaven
• Second coming
• Eternal life
• Prophecy
• Old Testament
• Savior
• Teaching of Jesus
• Revelation
• Christian concept of God
• Islam (comparative)
• Origins as a Jewish sect
• Eastern Mediterranean
• Roman Empire
• Armenia
• Tiridates III
• Kingdom of Aksum
• Early empires
• Middle Ages
• Europe
• Christianization
• Middle East
• North Africa
• India
• Age of Discovery
• Missionary work
• Colonization
• Americas
• Modern statistics