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.
Unionism in Ireland
Most Unionists in Northern Ireland are Protestants and most Nationalists are Catholics, but this generalisation (which is evident in the work of some commentators) is subject to significant qualifications. The Ulster Unionist Party, for example, has some Catholic members and supporters, such as Sir John Gorman, a respected former MLA. Polls taken over the years have suggested that as many as one in three Catholics could be considered Unionist, though this may not translate into support for Unionist parties at election time and the size of the foregoing figure has been questioned.