Comparison with Great Britain

In the 2011 census Northern Ireland had substantially more people stating that they were Christian (82.2%) than did England (59.4%), Scotland (53.8%) or Wales (57.6%).^{[13][14][15][16]} The proportion who stated that they had any religion was also higher in Northern Ireland (83%) than in England (68.1%), Scotland (56.3%) or Wales (60.3%).^{[13][14][15][16]} In Northern Ireland those who did not state any religion in the 2011 census amounted to 13.9% of the population, lower than in England (31.9%), Scotland (43.7%) or Wales (39.7%).^{[13][14][15][16]} This represented an increase from the 2001 census in those not stating a religion of 11.7% in Northern Ireland, lower than the increases in England (54.5%), Scotland (38.1%) or Wales (57.6%).^{[13][14][15][16]}

Secularisation in Northern Ireland has followed different paths within each of the two main communities, being at a more advanced stage within the mainly Protestant community in which it is reflected more often with a formal move away from the churches and by expressing no formal religious attachment, mirroring the pattern in Great Britain, whereas in the mainly Catholic community it is reflected by declining mass attendance but often with retaining a formal Catholic identification, mirroring the pattern in the Republic of Ireland.^[17] Those stating that they had no religion in the 2011 census were concentrated in largely Protestant areas, suggesting that they were mostly from a Protestant background.

Comparison with the Republic of Ireland

In their respective 2011 censuses Northern Ireland had a lower proportion of people stating that they were Christian (82.3%) than the Republic of Ireland (90.4%) and had a higher proportion of people stating that they had no religion or not indicating a religious belief (16.9%) than the Republic of Ireland (7.6%). While in the 2011 census 84.2% of people in the Republic of Ireland identified themselves as Catholic in the 2011 census in Northern Ireland only 40.8% identified themselves as Catholic.

Islam

While there were a small number of Muslims already living in what became Northern Ireland in 1921, the bulk of Muslims in Northern Ireland today come from families who have immigrated since the late 20th century. At the time of the 2011 Census there were 3,832 living in Northern Ireland,^[18] although by the 2021 census, the Muslim population stood at 10,870 (or 0.57% of the population). The Belfast Islamic Centre states that roughly half of the Muslim population lives in Belfast alone.^[19] The Muslims in Northern Ireland come from over 40 countries of origin, from Western Europe all the way through to the Far East.^[20] This situation is reflected in comparably complex institutional arrangements.^[21]

Judaism

The earliest recorded Jew living in Northern Ireland was a tailor by the name of Manuel Lightfoot in 1652. The first Jewish congregation in Northern Ireland, Belfast Hebrew Congregation, was founded in 1870. In 2006, there were an estimated 300 Jewish people living in Northern Ireland.^[22]

Baháʼí Faith

The Baháʼí Faith in Northern Ireland begins after a century of contact between Irishmen and Baháʼís beyond the island and on the island.^[23][24][25] The members of the religion elected its first Baháʼí Local Spiritual Assembly in 1949 in Belfast.^[26] The Baháʼís held an international conference in Dublin in 1982 which was described as “…one of the very few occasions when a world event for a faith community has been held in Ireland".^[27] By 1993 there were a dozen assemblies in Northern Ireland.^[28] By 2005 Baháʼí sources claim some 300 Baháʼís across Northern Ireland.^[29]

Hinduism

Hinduism is a relatively minor religion in Northern Ireland with only around 200 Hindu families in the region.^[30] There are, however, three Mandirs in Belfast and by the 2021 census the Hindu population had risen to 4,190 (or 0.22% of the population).

The Troubles

The Troubles were a period of ethno-political conflict in Northern Ireland which spilled over at various times into Great Britain and the Republic of Ireland. The duration of the Troubles is conventionally dated from approximately 1968 to the signing of the Belfast Agreement in 1998. Violence nonetheless continued beyond this period and still manifests on a small-scale basis.^[31]

The principal issues at stake in the Troubles were the constitutional status of Northern Ireland and the relationship between the mainly-Protestant Unionist and mainly-Catholic Nationalist communities in Northern Ireland. The Troubles had both political and military (or paramilitary) dimensions. Its participants included politicians and political activists on both sides, republican and loyalist paramilitary organisations, the Royal Ulster Constabulary, the British Army and the security forces of the Republic of Ireland.