Presbyterianism in the context of "Jean Calvin"

The Four Marks of the Church, also known as the Attributes of the Church, describes four distinctive adjectives of traditional Christian ecclesiology as expressed in the Nicene Creed completed at the First Council of Constantinople in AD 381: "[We believe] in one, holy, catholic, and apostolic Church."

This ecumenical creed is today recited in the liturgies of the Eastern Orthodox Church, the Catholic Church (both Latin and Eastern Rites), the Oriental Orthodox Churches, the Assyrian Church of the East, the Moravian Church, the Lutheran Churches, the Methodist Churches, the Presbyterian Churches, the Anglican Communion, and by members of the Reformed Churches, although they interpret it in very different ways, and some Protestants alter the word "Catholic" in the creed, replacing it with the word "Christian".

Christianity has been the largest religion in Ireland since the 5th century. After a pagan past of Antiquity, missionaries (most famously including Saint Patrick) converted the Irish tribes to Christianity in quick order. This produced a great number of saints in the Early Middle Ages, as well as a faith interwoven with Irish identity for centuries since − though less so in recent times.

Most Christian churches are organized on an "all-Ireland" basis, including both the Republic of Ireland and Northern Ireland. In the 2022 census, 76.1% of residents in the Republic of Ireland identified as Christians: 69.1% as Catholics, 4.2% as Protestants, 2.1% as Orthodox Christians and 0.7% as other Christians. In the 2021 Northern Irish census, 79.7% of residents identified as Christians: 42.3% as Catholics, 16.6% as Prebysterian, 11.5% as Church of Ireland members, 2.4% as Methodist and 6.9% as other Christians. Orthodoxy has been the fastest growing branch of Christianity in Ireland since 1991.

Christianity is the largest religion in the United Kingdom. Results of the 2021 Census for England and Wales showed that Christianity is the largest religion (though it makes up less than half of the population at 46.2%), followed by the non-religious (37.2%), Islam (6.5%), Hinduism (1.7%), Sikhism (0.9%), Buddhism (0.5%), Judaism (0.5%), and others (0.6%). Among Christians, Anglicanism is the most common denomination, with 53% of Christian believers in the UK identifying with this denomination as of 2023, followed by Catholicism, Presbyterianism, Methodism, Unitarianism, and Baptists. Results for the 2022 census in Scotland indicated that the majority (51%) had no religion, but that 38.8% of the Scottish population identified as Christian (of which 20% identified with the Church of Scotland and 13% with the Catholic Church). In Northern Ireland, Christianity is the largest religion (79.7%) followed by non-religious (17.4%), other religions (1.3%), and not stated (1.5%), as of 2021.

A deacon is a member of the diaconate, an office in Christian churches that is generally associated with service of some kind, but which varies among theological and denominational traditions.

Major Christian denominations, such as the Catholic Church, the Oriental Orthodox Churches, the Eastern Orthodox Church, Lutheranism, Presbyterianism, Methodism, and Anglicanism, view the diaconate as an order of ministry.

Reformed Christianity, also called Calvinism, is a major branch of Protestantism that began during the 16th-century Protestant Reformation. In the modern day, it is largely represented by the Continental Reformed, Presbyterian, and Congregational traditions, as well as parts of the Anglican (known as "Episcopal" in some regions), Baptist and Waldensian traditions, in addition to a minority of persons belonging to the Methodist faith (who are known as Calvinistic Methodists).

Reformed theology emphasizes the authority of the Bible and the sovereignty of God, as well as covenant theology, a framework for understanding the Bible based on God's covenants with people. Reformed churches emphasize simplicity in worship. Several forms of ecclesiastical polity are exercised by Reformed churches, including presbyterian, congregational, and some episcopal. Articulated by John Calvin, the Reformed faith holds to a spiritual (pneumatic) presence of Christ in the Lord's Supper.

Anglo-Irish people (Irish: Angla-Éireannach) denotes an ethnic, social and religious grouping consisting mostly of the descendants and successors of the English Protestant Ascendancy in Ireland. Predominantly, the Anglo-Irish belong to the Anglican Church of Ireland, which was the established Church of Ireland until 1871 or, to a lesser extent, to one of the English Dissenting Churches, such as Baptists, Presbyterians, the Methodist Church. However, some were Roman Catholics. They often defined themselves simply as "British", or less frequently as "Anglo-Irish", "Irish" or "English". Many became notable as administrators in the British Empire or as senior army and naval officers. The Kingdom of England and Great Britain were in a real union with the Kingdom of Ireland for over a century, before politically uniting into the United Kingdom of Great Britain and Ireland in 1801.

The term is not usually applied to Presbyterians in the province of Ulster, whose ancestry is mostly Lowland Scottish, rather than English or Irish, and who are sometimes identified as Ulster Scots. The Anglo-Irish hold a wide range of political views, with some being outspoken Irish nationalists, but most overall being Unionists. And while most of the Anglo-Irish originated in the English diaspora in Ireland, others were descended from families of the old Gaelic nobility of Ireland.