Catholic Church in Ireland
In the 2016 Irish census 78.3% of the population identified as Catholic in Ireland; numbering approximately 3.7 million people. Unlike Catholics in the United States, Ireland has seen a significant decline from the 84.2% who identified as Catholic in the 2011 census.
Religion in Northern 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.