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.
Irish Australians
According to census data released by the Australian Bureau of Statistics in 2004, Irish Australians are, by religion, 46.2% Roman Catholic, 15.3% Anglican, 13.5% other Christian denomination, 3.6% other religions, and 21.5% "No Religion".