Joshua Bennett
Catholicism is the largest denomination of Christianity, with 1.27 to 1.41 billion baptized Catholics worldwide as of 2025. It is among the world's oldest and largest international institutions and has played a prominent role in the history and development of Western civilization. While all Catholics are Christians, not all Christians are Catholics. Catholicism is led by the Pope, who is the Bishop of Rome, and the Holy See forms the church's central government. There are three types of Catholic parishes: Diocesan Roman Catholic parishes, Traditional or Extraordinary form parishes, and Eastern Catholic Churches that are in full communion with Rome.
| Characteristics | Values |
|---|---|
| Number of Catholics worldwide | 1.27 to 1.41 billion |
| Number of dioceses | 3,171 |
| Number of parishes | 221,700 |
| Number of Eastern Catholic Churches | 23 |
| Type of Catholic parishes | Diocesan Roman Catholic parishes, "Traditional" or Extraordinary form parishes |
| Branches of Christianity | Eastern Orthodoxy, Protestantism, Roman Catholicism |
| Largest branch of Christianity | Roman Catholicism |
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What You'll Learn
Catholicism is the largest denomination of Christianity
Catholicism, also known as the Roman Catholic Church, is the largest denomination of Christianity. It is among the world's oldest and largest international institutions and has played a prominent role in the history and development of Western civilization. The Catholic Church consists of 24 sui iuris (autonomous) churches, including the Latin Church and 23 Eastern Catholic Churches, which comprise almost 3,500 dioceses and eparchies around the world, each overseen by one or more bishops.
The Catholic Church has 1.27 to 1.41 billion baptized members worldwide as of 2025, though this figure does not include independent denominations that identify as Catholic, such as Old Catholicism and other forms of Independent Catholicism, which have around 18 million adherents. This means that around 50% of all Christians are Catholics, which is more than all other Christians combined and more than all Buddhists or Hindus. There are also more Catholics than followers of the individual traditions of Sunni and Shi'i Islam, though there are more Muslims overall.
The Catholic Church is led by the Pope, who is the bishop of Rome, and the Holy See, which forms the church's central government, making decisions on issues of faith and morality. The Pope and Holy See reside in Vatican City, an enclave in Rome, which is the world's smallest fully independent nation-state. The Vatican Palace is a major site of tourism, home to notable sites such as the Sistine Chapel and St. Peter's Basilica.
Catholicism is considered the root from which all other Christian denominations have branched off, and it is the only denomination, along with Eastern Orthodoxy, that can trace apostolic succession back to Christ.
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The three branches of Catholicism
There are indeed different branches within the Catholic Church, and these can be broadly categorized into three main traditions or rites: Latin, Eastern, and Oriental.
Latin Catholicism
The Latin Catholic Church is by far the largest and most widespread of the three branches. It is often simply referred to as "the Catholic Church" due to its size and influence. The Latin Church follows the Latin liturgical rites and is headed by the Bishop of Rome, the Pope. This branch of Catholicism is characterized by its Western European heritage and traditions, and it is predominantly found in Western countries, although it has a global presence due to missionary activity. The Code of Canon Law, the legal system of the Latin Catholic Church, is another distinguishing feature.
Eastern Catholicism
Eastern Catholic Churches are those Catholic Churches that follow Eastern Christian traditions and liturgies but are in full communion with the Pope in Rome. These churches have a heritage that originates in Eastern Europe, the Middle East, and parts of Asia, and they maintain their unique liturgical rites, theological traditions, and cultural practices while recognizing the Pope's authority. There are over 20 Eastern Catholic Churches, including the Maronite Catholic Church, the Ukrainian Greek Catholic Church, and the Syro-Malabar Catholic Church, each with its own distinct history and traditions.
Oriental Orthodoxy
The Oriental Orthodox Churches are a separate communion of Christian churches that are not in full communion with the Catholic Church but share many similarities, especially in their liturgical and theological traditions. These churches rejected the Council of Chalcedon in 451 AD, leading to a schism. However, in recent times, there have been efforts to foster unity, and some Oriental Orthodox Churches have established a degree of communion with the Catholic Church, such as the Coptic Catholic Church and the Ethiopian Catholic Church.
While these three branches have distinct characteristics, they all share fundamental beliefs and sacraments, and together, they constitute the rich diversity of the Catholic faith, each contributing unique spiritual and cultural traditions. It is important to recognize and value this diversity as a strength of the Catholic Church, showing its ability to embrace and unite people from various cultural and theological backgrounds.
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The Latin Church
The Catholic Church is the largest Christian church, with 1.27 to 1.41 billion baptised members worldwide as of 2025. It is one of the world's oldest and largest international institutions and has played a prominent role in the history and development of Western civilisation. The Catholic Church consists of 24 autonomous churches, including the Latin Church and 23 Eastern Catholic Churches, each overseen by one or more bishops.
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Eastern Catholic Churches
The Catholic Church is made up of 24 churches—one Latin (Roman) and 23 Eastern or Oriental churches. The Latin Church is the only Western-tradition church and has more than 1 billion members worldwide. In comparison, the 23 self-governing Eastern Catholic Churches have a combined membership of 17.3 million as of 2010.
The five liturgical traditions of Eastern Christianity—the Alexandrian Rite, the Armenian Rite, the Byzantine Rite, the East Syriac Rite, and the West Syriac Rite—are all represented within Eastern Catholic liturgy. The Second Vatican Council's decree on the Eastern Catholic churches, Orientalium Ecclesiarum, asserts that the "variety" among the Eastern churches "in no way harms [the Catholic Church's] unity; rather it manifests it." All of the churches are of equal dignity and are encouraged to preserve and develop their liturgy and "way of life."
The Eastern Catholic Churches are governed by the 1990 Code of Canons of the Eastern Churches (CCEO), which defines an autonomous church as:
> A group of Christian faithful linked in accordance with the law by a hierarchy and expressly or tacitly recognized by the supreme authority of the Church as autonomous is in this Code called an autonomous Church.
Some Eastern Catholic Churches have adopted Latin customs, causing concern among the Orthodox that they will lose their distinct traditions.
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The role of the Pope
Catholicism, also known as Roman Catholicism, is one of the three major branches of Christianity, alongside Eastern Orthodoxy and Protestantism. It is led by the Pope, who is the bishop of Rome and the chief pastor of the church. The Pope resides in Vatican City, an enclave in Rome, and is the head of the Holy See, the central government of the Catholic Church.
The Pope is the successor to Saint Peter, to whom primacy was conferred by Jesus, who gave him the Keys of Heaven and the power of "binding and loosing", naming him as the rock" upon which the Church would be built. The Pope is also known as the vicar of Christ on earth, the earthly representative of Jesus in his absence, and as such, has full, supreme, and universal power over the Catholic Church. The Catholic Church traces the line of succession of Popes back to Saint Paul, with the current Pope, Leo XIV, being elected on May 8, 2025.
Over the centuries, the Pope and the papacy have accrued significant secular and political influence, often rivaling that of territorial rulers. Popes have intervened in various doctrinal disputes and played a role in the expansion of the Christian faith. They have also served as mediators and arbitrators between Christian monarchs. For example, Pope Clement VIII ended the French Wars of Religion by accepting King Henry IV of France's Edict of Nantes, which granted civil and religious toleration to French Protestants. Pope Innocent III placed England under interdict until King John made his kingdom a fiefdom to the Pope, complete with yearly tribute.
In recent times, the papacy's direct involvement in politics has declined, and the office is now largely focused on religious matters. However, Popes still retain significant political influence and continue to play a role in international relations and interfaith dialogue. For example, Pope John Paul II was influential in the fall of Communism in Eastern Europe and mediated the Beagle conflict between Argentina and Chile. Pope Francis helped broker improved relations between the United States and Cuba in 2015.
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Frequently asked questions
No, Catholicism is the largest denomination of Christianity. All Catholics are Christians, but not all Christians are Catholics.
There are three types of Catholic parishes: Diocesan Roman Catholic parishes, "Traditional" or Extraordinary form parishes, and Eastern Catholic Churches.
Roman Catholicism is the largest branch of the Catholic Church, with 99.99% or more of all Catholics belonging to this church. Eastern Catholic Churches are in full communion with Rome but have their own liturgies and customs.
