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.
Religion in Iceland
Starting in the 1530s, Iceland, originally Catholic and under the Danish crown, formally switched to Lutheranism with the Icelandic Reformation, which culminated in 1550. The Lutheran Church of Iceland has remained since then the country's state church. Freedom of religion has been granted to the Icelanders since 1874. The Church of Iceland is supported by the government, but all registered religions receive support from a church tax ("sóknargjald") paid by taxpayers over the age of sixteen.