 Ireland 's largest religious group is Christianity . The largest denomination is Roman Catholicism representing over 73 % for the island ( and about 87 % of the Republic of Ireland ) . Most of the rest of the population adhere to one of the various Protestant denominations ( about 48 % of Northern Ireland ) . The largest is the Anglican Church of Ireland . The Muslim community is growing in Ireland , mostly through increased immigration , with a 50 % increase in the republic between the 2006 and 2011 census . The island has a small Jewish community . About 4 % of the Republic 's population and about 14 % of the Northern Ireland population describe themselves as of no religion . In a 2010 survey conducted on behalf of the Irish Times , 32 % of respondents said they went to a religious service more than once a week . 
 Ireland <a href='null_genetive' title='1'><mark>'s</mark></a>largest religious group <a href='drop_aux' title='2'><mark>is</mark></a>Christianity . The largest denomination <a href='drop_aux' title='3'><mark>is</mark></a>Roman Catholicism representing over 73 % for the island ( and about 87 % of the Republic of Ireland ) . Most of the rest of the population <a href='uninflect' title='4'><mark>adhere</mark></a> to one of the various Protestant denominations ( about 48 % of Northern Ireland ) . The largest <a href='drop_aux' title='5'><mark>is</mark></a>the Anglican Church of Ireland . The Muslim community is growing in Ireland , mostly through increased immigration , with a 50 % increase in the republic between the 2006 and 2011 census . The island <a href='got' title='6'><mark>has</mark></a> a small Jewish community . About 4 % of the Republic <a href='null_genetive' title='7'><mark>'s</mark></a>population and about 14 % of the Northern Ireland population describe themselves as of no religion . In a 2010 survey conducted on behalf of the Irish Times , 32 % of respondents said they went to a religious service more than once a week . 
Ireland  largest religious group Christianity . The largest denomination Roman Catholicism reppin ova 73 % fir the island ( and about 87 % of the Republic of Ireland ) . Most of da rest of the population adhered to one of tdavarious Protestant denominations ( abt 48 % of Northern Ireland ) . Thdaargest the Anglican Church of Ireland . The Muslim community is growin in Ireland , mostly through increased immigration , wit a 50 % increase in thedapublic between the da6 and 2011 census . The island got a small Jewish community . Abbou % of the Rdablic  population and about 14 % of the Northern Ireland population describe themselves as of no religion . In a 2010 survey conducted on behalf of the Irish Times , 32 % of respondents said they went to a religious service more den once a week .