Religion in the Republic of Ireland
The predominant religion in the Republic of Ireland is Christianity, with the largest church being the Roman Catholic Church. The Irish constitution says that the state may not endorse any particular religion and guarantees freedom of religion.
Protestantism in the Republic of Ireland
Despite this, Protestantism since 2002 has been relegated to the third largest group recorded on the census, having been overtaken by those who choose "No Religion". Overall Protestants accounted for 4% of the total Irish population in 2006 and 2011. In the 2016 census Protestantism accounted for 4.2% of the population.