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.
County Antrim
The Presbyterian Church in Ireland is the largest religious denomination, followed by the Catholic Church and the Anglican Church of Ireland. County Antrim is one of two counties in Ireland in which the majority of people are Protestant, according to the 2001 census, the other being Down. The strong Presbyterian presence in the county is due largely to the county's historical links with lowland Scotland, which supplied many immigrants to Ireland. Protestants are the majority in most of the county, whilst Catholics are concentrated in Belfast, particularly the west of the city, the northeast, and on the shore of Lough Neagh.