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.
Same-sex marriage in the Republic of Ireland
A Pew Research Center poll, conducted between April and August 2017 and published in May 2018, showed that 66% of Irish people supported same-sex marriage, 27% were opposed and 7% didn't know or refused to answer. When divided by religion, 87% of religiously unaffiliated people, 80% of non-practicing Christians and 43% of church-attending Christians supported same-sex marriage. Opposition was 20% among 18-34-year-olds.