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
Christianity is the main religion in Northern Ireland. The 2011 UK census showed 42.8% Roman Catholic, 21.1% Presbyterian Church, with the Church of Ireland having 16.7% and the Methodist Church 5.0%. Members of other Christian churches comprised 5.8%, 7.9% stated they have no religion or did not state a religion, and members of non-Christian religions were 0.8%.