
Northern Ireland's religious landscape has been historically divided between Protestants and Catholics, with the country's formation in 1921 intending to establish a Protestant majority nation. However, recent demographic shifts have resulted in a milestone: the Catholic population has outnumbered Protestants for the first time. According to the 2021 census, 45.7% of Northern Ireland's 1.9 million people identified as Catholic or were from Catholic backgrounds, compared to 43.5% identifying as Protestants. This shift has sparked discussions about the region's political future, with some calling for a referendum on Irish unity.
| Characteristics | Values |
|---|---|
| Total population | 1.9 million |
| Percentage of Catholics | 45.7% |
| Percentage of people from a Catholic background | 46% |
| Percentage of Protestants | 43.5% |
| Percentage of people from a Protestant background | 43.48% |
| Percentage of people with no religion or no stated religion in 2011 | 16.9% |
| Percentage of Christians in 2011 | 82.2% |
| Percentage of Muslims in 2021 | 0.57% |
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What You'll Learn

Northern Ireland's population is approximately 1.9 million
As of 2022, Northern Ireland's population is estimated to be just under 1.9 million people. This includes people of various religious affiliations, with the two main traditions being Protestant and Catholic. While the population size may seem modest compared to larger countries, Northern Ireland has a high population density, with around 350 people per square mile. This density is especially notable given the country's small geographical area of approximately 5,500 square miles.
Now, delving into the religious demographics, it's important to understand the historical context. The religious divide between Catholics and Protestants has long been a significant factor in Northern Irish society and politics, dating back to the conflict known as "The Troubles," which lasted from the 1960s to the 1990s. During this time, the Catholic population was often subject to discrimination and was largely disadvantaged economically and socially.
In terms of numbers, Northern Ireland has a slightly higher proportion of Protestants than Catholics. Recent surveys and censuses indicate that around 42% of the population identifies as Protestant, while roughly 40% identify as Catholic. This near-equal split highlights the significance of these religious groups in shaping the region's culture and history. The remaining portion of the population includes those with other religious affiliations, such as Islam, Hinduism, and Judaism, as well as those who identify as non-religious or do not specify a religious affiliation.
It's worth noting that the religious landscape is changing. While Northern Ireland has historically been predominantly Christian, there has been a gradual decline in religious affiliation in recent decades, a trend observed in many parts of the world. This shift is particularly noticeable among younger generations, who tend to be less religiously affiliated than their older counterparts. Nonetheless, the Catholic and Protestant traditions remain integral parts of Northern Ireland's cultural fabric, influencing everything from education and marriage patterns to political affiliations.
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45.7% of Northern Ireland's population is Catholic
Northern Ireland has witnessed a significant shift in its religious demographics, with the latest 2021 census data indicating that 45.7% of its population identifies as Catholic or is from a Catholic background. This marks the first time that Catholics have outnumbered Protestants in the region, a demographic milestone for a state historically designed to maintain a permanent Protestant majority.
The 2021 census results highlight a notable change from the previous census in 2011, which showed Protestants comprising 48% of the population, compared to 45% Catholics. The recent census data also revealed that 43.48% of the population identified as Protestant or other Christian denominations, while the remaining 11% belonged to non-Christian religions or had no religious affiliation.
The increase in the Catholic population can be attributed to various factors, including higher birth rates among Catholics, which gradually reduced the gap between the two religious groups. Additionally, the region has experienced a loosening of British identity, with more people identifying as Irish or Northern Irish exclusively. This shift in national identity may also be influenced by the post-Brexit landscape, which has impacted trade relations and prompted discussions about a united Ireland.
While the Catholic population has grown, it is important to note that Northern Ireland currently does not have a majority religion. Neither Catholics nor Protestants constitute a majority, and a significant proportion of the population, approximately 20%, consists of centrist voters who defy traditional sectarian labels and may feel more strongly connected to a Northern Irish identity rather than exclusively Irish or British.
The changing religious and political landscape in Northern Ireland has implications for the future of the region. The shift in demographics may impact voting patterns and the support for nationalist or unionist parties. The increased Catholic population does not necessarily equate to stronger support for a united Ireland, as a substantial number of Catholic and Protestant voters support cross-community parties. The future of Northern Ireland's relationship with the UK and Ireland remains uncertain, and the role of religion in shaping these dynamics will continue to be a subject of interest.
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Protestants previously outnumbered Catholics
Northern Ireland's sectarian divisions can be traced back to the 17th century when Protestant settlers from Scotland and England were settled in the northeastern part of the island to strengthen the authority of the English Crown. The Troubles, a violent ethno-political conflict, lasted from 1968 to 1998 and saw more than 3,000 deaths during three decades of fighting between mainly Catholic Irish nationalists seeking a united Ireland, mainly Protestant pro-British loyalists, and the British Army.
The state of Northern Ireland was established in 1921 to protect the interests of the Protestant community, with six counties partitioned from Ireland based on religious data from the 1911 census. At the time, 34.4% of what would become Northern Ireland was Catholic, and 61.4% was Protestant. The 2011 census showed that Protestants still outnumbered Catholics, with 48% of the population Protestant compared to 45% Catholic.
However, demographic trends indicated that the Catholic population was growing due to higher birth rates, and it was predicted that Catholics could become a majority within a generation. This shift has come to pass, with the 2021 census showing that 45.7% of the population identified as Catholic or were brought up Catholic, compared to 43.48-43.5% identifying as Protestant. While this does not amount to a majority Catholic population, it is a significant milestone and has dealt a psychological blow to unionists, who relied on a Protestant majority to safeguard Northern Ireland's position in the UK.
The religious and political landscape of Northern Ireland is complex and evolving. While Catholics tend to vote for Irish nationalist parties and support a united Ireland, an increase in the Catholic population does not automatically equate to stronger support for unification. A significant minority of Catholics and Protestants support cross-community parties, and opinion polls show that more people currently favour remaining in the UK. Nonetheless, the changing demographics have important implications for Northern Ireland's future, and the increased Catholic population may influence the call for a referendum on Irish unity.
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Northern Ireland has no majority religion
Northern Ireland has a rich religious history, with a variety of faiths and denominations. While it has long been associated with Christianity, and particularly with the Catholic-Protestant divide, it cannot be said that Northern Ireland has a majority religion.
The 2021 census revealed that 42% of the population described themselves as Catholic, while 46% said they were from a Catholic background. This is a notable shift from the 2011 census, where 40.8% identified as Catholic, and the 2001 census, where the figure was 45%. However, it is important to emphasise that 42% and 46% are minorities, not majorities. Therefore, it cannot be said that Catholics are a majority in Northern Ireland, numerically or in terms of background.
The 2021 census also showed that 43% of the population had a Protestant or other non-Catholic Christian background. This is a decrease from the 2011 census, where 48% identified as Protestant, and the 2001 census, where the figure was 43.48%. The 2021 census figures indicate that neither Catholics nor Protestants constitute a majority in Northern Ireland.
The religious landscape of Northern Ireland is complex and evolving. While Christianity remains the largest religion, with 79.7% identifying as Christian in the 2021 census, there has been a notable rise in those identifying as non-religious, standing at 17.4%. This points to a growing secularisation of Northern Irish society, mirroring trends in Great Britain and the Republic of Ireland. The number of people from other religious minorities, such as Muslims, Sikhs, Hindus, Buddhists, and Jews, is also increasing.
The religious and political landscape of Northern Ireland has historically been intertwined, with the Troubles being a period of ethno-political conflict between mainly Protestant Unionists and mainly Catholic Nationalists. However, this relationship is changing. The rise in those identifying as non-religious is more pronounced in traditionally Protestant areas, while those from a Catholic background may retain a formal Catholic identification but attend mass less frequently. Additionally, voting patterns are no longer as closely tied to religious background, with many voters rejecting traditional sectarian labels and feeling more strongly Northern Irish than Irish or British.
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The number of people identifying as non-religious is growing
Northern Ireland was created as a state with a two-thirds Protestant majority in 1921. Six counties were partitioned from Ireland, based on religious data from the 1911 census, which showed that 34.4% of what would become Northern Ireland was Catholic, and 61.4% was Protestant.
In the 2011 census, 40.8% of people identified as Catholic, 19.1% as Presbyterian, 13.7% as members of the Church of Ireland, and 5.0% as Methodist. 17% stated they had no religion or did not state a religion, and members of non-Christian religions made up 0.8% of the population. In the 2021 census, 45.7% of inhabitants identified as Catholic, compared with 43.48% from Protestant or other Christian backgrounds. This is the first time that Catholics have outnumbered Protestants in Northern Ireland.
The secularization of Northern Ireland has followed different paths within its two main communities. In the mainly Protestant community, secularization is reflected by a formal move away from the churches and by expressing no formal religious attachment. In the mainly Catholic community, it is reflected by declining mass attendance but often with a retained formal Catholic identification. 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.
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Frequently asked questions
According to the 2021 census, 45.7% of Northern Ireland's population of 1.9 million identify as Catholic or were brought up Catholic. This amounts to a total of around 868,300 Catholics living in Northern Ireland.
No. In fact, the 2011 census showed that Protestants outnumbered Catholics 48% to 45%.
Northern Ireland currently has no majority religion, either in terms of people's current religious position or their family background.
In the 2011 census, 84.2% of people in the Republic of Ireland identified as Catholic, compared to 40.8% in Northern Ireland.














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