Ireland has two main religious groups. The majority of Irish are Roman Catholic, and a smaller number are Protestant (mostly Anglicans and Presbyterians). However, there is a majority of Protestants in the northern province of Ulster.

Are the Irish still Catholic?

Irish Christianity is dominated by the Catholic Church, and Christianity as a whole accounts for 82.3% of the Irish population. Most churches are organized on an all-Ireland basis which includes both Northern Ireland and the Republic of Ireland.

Are all Irish Catholic?

In the 2016 Irish census 78.3% of the population identified as Catholic in Ireland; numbering approximately 3.7 million people. Ireland has seen a significant decline from the 84.2% who identified as Catholic in the 2011 census. ... 65% of Irish Catholics support same-sex marriage and 30% oppose it.