The 2021 Northern Ireland Census marked the first time since records began where the Catholic share of the population was larger than the combined Protestant share. In 2021, over 42 percent of the population classified themselves as Catholic or from a Catholic background, in comparison with 37 percent classified as Protestant or from a Protestant background. Additionally, the share of the population with no religion (or those who did not answer) was 19 percent; larger than any individual Protestant denomination. This marks a significant shift in demographic and societal trends over the past century, as Protestants outnumbered Catholics by roughly 2:1 when Northern Ireland was established in the 1920s. Given the Catholic community's historic tendency to be in favor of a united Ireland, many look to the changing religious composition of the population when assessing the potential for Irish reunification. Religion's historical influence A major development in the history of British rule in ireland was the Plantation of Ulster in the 1600s, where much of the land in the north (historically the most rebellious region) was seized from Irish Catholics and given to Protestant settlers from Britain (predominantly Scots). This helped establish Protestant dominance in the north, created a large section of the population loyal to the British crown, and saw a distinct Ulster-Scots identity develop over time. In the 1920s, the republican movement won independence for 26 of Ireland's 32 counties, however, the six counties in Ulster with the largest Protestant populations remained part of the UK, as Northern Ireland. Following partition, structural inequalities between Northern Ireland's Protestant and Catholic communities meant that the Protestant population was generally wealthier, better educated, more politically empowered, and had better access to housing, among other advantages. In the 1960s, a civil rights movement then emerged for equal rights and status for both sides of the population, but this quickly turned violent and escalated into a the three-decade long conflict now known as the Troubles.

The Troubles was largely fought between nationalist/republican paramilitaries (mostly Catholic), unionist/loyalist paramilitaries (mostly Protestant), and British security forces (including the police). This is often described as a religious conflict, however it is more accurately described as an ethnic and political conflict, where the Catholic community generally favored Northern Ireland's reunification with the rest of the island, while the Protestant community wished to remain in the UK. Paramilitaries had a large amount of support from their respective communities in the early years of the Troubles, but this waned as the conflict progressed into the 1980s and 1990s. Demographic and societal trends influenced the religious composition of Northern Ireland's population in these decades, as the Catholic community had higher fertility rates than Protestant communities, while the growing secularism has coincided with a decline in those identifying as Protestant - the dip in those identifying as Catholic in the 1970s and 1980s was due to a protest and boycott of the Census. The Troubles came to an end in 1998, and divisions between both sides of the community have drastically fallen, although they have not disappeared completely.

Ireland: Protestant Christians as percent of the total population: The latest value from 2013 is 2.5 percent, unchanged from 2.5 percent in 2012. In comparison, the world average is 22.7 percent, based on data from 78 countries. Historically, the average for Ireland from 1960 to 2013 is 3.3 percent. The minimum value, 2.5 percent, was reached in 2012 while the maximum of 4.3 percent was recorded in 1960.

Ireland: Catholic Christians as percent of the total population: The latest value from 2013 is 92.6 percent, unchanged from 92.6 percent in 2012. In comparison, the world average is 43.2 percent, based on data from 84 countries. Historically, the average for Ireland from 1960 to 2013 is 93.2 percent. The minimum value, 92.6 percent, was reached in 2011 while the maximum of 93.9 percent was recorded in 1960.

The Good Friday Agreement, or the Belfast Agreement, was the culmination of the Northern Ireland peace process that brought about the end of the 30-year conflict known as the Troubles. The peace process itself involved years of negotiations between the leading nationalist parties (generally seen as representing Northern Ireland's Catholic community), unionist parties (generally seen as representing Northern Ireland's Protestant community), representatives of the British, Irish, and U.S. governments, as well as paramilitary organizations. Terms of the Good Friday Agreement The Agreement involved a series of proposals touching aspects such as demilitarization, identity, devolution, and cross-community cooperation. The Agreement laid the framework for the Northern Ireland government to be reinstated after a 25-year absence, with mechanisms in place to ensure power-sharing and fair representation between Northern Ireland's Catholic and Protestant communities. It also reaffirmed Northern Ireland's position as an equal part of the United Kingdom, but stipulated that the people of Northern Ireland may change this through a referendum (generally assumed to mean reunification with the Republic of Ireland), while it also extended British and Irish citizenship to anybody born in the north. In terms of demilitarization and ending the violence, the Agreement stipulated that all complying paramilitary groups were to disarm and cease operations, and it ensured the British Army presence in Northern Ireland would be significantly reduced. To many, the most controversial aspect of the Agreement was the early release of convicted paramilitary personnel from organization who signed the Agreement, regardless of the charge or length of their remaining sentence - for this reason, the hardline Democratic Unionist Party (DUP) did not support the Agreement. The referendum The Good Friday Agreement was signed by the respective parties on April 10, 1998 (albeit, without the support from the DUP and some smaller paramilitary groups), and was then put to the public on both sides of the Irish border in referenda on May 22, 1998. The vote passed easily on both sides, with ** percent support in the north, and ** percent in the south. In Northern Ireland, the background of voters was not recorded, and therefore there is no official breakdown of the vote by religious background, yet, the most widely accepted estimates suggest that support in Catholic communities may have been as high as ** percent, while support in Protestant communities was roughly ** percent - again, largely in opposition to the early release of paramilitary prisoners.

During the Troubles, the British government introduced a policy of internment in Northern Ireland, whereby authorities had the power to arrest and detain without trial individuals believed to be associated with paramilitary organizations. Between August 9. 1971 and December 5. 1975, almost 2,000 people were interned by the police and British Army. Around 95 percent of these were from a Catholic background, while the first Protestant internees were not arrested until 1973. Internment was introduced in an attempt to weaken the IRA and other nationalist paramilitary groups, however it had the opposite effect. Mismanagement and outdated information saw hundreds of unaffiliated people interned, some of those interned suffered police brutality and were coerced into confessions, and several anti-internment protests turned into some of the bloodiest days of the Troubles. These factors combined to bolster support for Catholic paramilitaries, who gradually transitioned from using defensive to offensive tactics in the early 1970s, and these groups would go on to be responsible for the largest number of combined deaths during the Troubles.

Irlande: Protestant Christians as percent of the total population: Pour cet indicateur, The Cline Center for Democracy fournit des données pour la Irlande de 1960 à 2013. La valeur moyenne pour Irlande pendant cette période était de 3.3 pour cent avec un minimum de 2.5 pour cent en 2012 et un maximum de 4.3 pour cent en 1960.

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In 1821, Ireland's population was just over 6.8 million people. During this time, the entire island was a part of the United Kingdom of Great Britain and Ireland, after both islands were united by the Acts of Union in 1800. From the graph we can see that the population enjoyed steady growth between 1821 and 1841, and it rose by almost 1.4 million people in this time. However the Great Famine, which lasted from 1845 to 1849, had a devastating impact on the population, causing it to drop from 8.18 million in 1841 to 6.55 million in 1851. The Great Hunger The famine was caused by a Europe-wide potato blight that contributed to mass starvation and death throughout the continent, although it's impact on Ireland was much harsher than anywhere else. The potato blight affected Ireland so severely as the majority of potatoes in Ireland were of a single variety which allowed the disease to spread much faster than in other countries. As the potato blight spread, the population became increasingly dependent on dairy and grain products, however a lot of these resources were relocated by the British military to combat food shortages in Britain. Due to disproportional dependency on potatoes, and mismanagement by the British government, over one million people died and a further one million emigrated. The Great Famine lasted from just 1845 to 1849, but it's legacy caused almost a century of population decline, and to this day, the population of Ireland has never exceeded it's pre-famine levels. Road to recovery The population decline continued well into the twentieth century, during which time the Republic of Ireland achieved independence from the British Empire. After centuries of fighting and rebellion against British rule, Irish nationalists finally gained independence from Britain in 1921, although the six counties with the largest Protestant populations formed Northern Ireland, which is still a part of the United Kingdom today. In spite of the conflict that overshadowed Ireland for much of the twentieth century, which claimed the lives of thousands of people (particularly during the Northern Irish Troubles), and despite Ireland's high emigration rate, the population began growing again in the second half of the 1900s. The population was at it's lowest from 1926 to 1961, where it remained around 4.3 million, but in the following half-century the population grew by over two million people, reaching 6.4 million in 2011, although this number is still lower than in 1821. Gender stats The difference between the male and female populations throughout Ireland's recent history has also remained relatively low. The largest difference occurred in 1831, where there are 170,000 more women than men, although these figures do not include military personnel which would reduce the difference significantly. The gap then remains under 60,000 throughout the twentieth century.

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