Ireland has been inhabited for at least 9,000 years, although little is known about the paleolithic and neolithic inhabitants of the island (other than by inference from genetic research in 2004 that challenges the idea of migration from central Europe and proposes a flow along the Atlantic coast from Spain). Early historical and genealogical records note the existence of dozens of different peoples that may or may not be "mythological" (Cruithne, Attacotti, Conmaicne, Eóganachta, Érainn, Soghain, to name but a few).
During the past 1,000 years or so, Vikings, Normans, Scots and English have all added to the indigenous gene pool.
Ireland's largest religious group is Christianity, of which the largest denomination is the Catholic Church (over 73% for the entire island, and about 86.8% for the Republic), and most of the rest of the population adhere to one of the various Protestant denominations. The largest is the Anglican Church of Ireland. The Irish Muslim community is growing, mostly through increased immigration (see Islam in Ireland). The island also has a small Jewish community (see History of the Jews in Ireland). Over 4% of the Republic's population describe themselves as of no religion.
Ireland has for centuries been a place of emigration, particularly to England, Scotland, the United States, Canada, and Australia. With growing prosperity, Ireland has become a place of immigration instead. Since joining the EU in 2004, Polish people have been the largest source of immigrants (over 150,000) from Central Europe, followed by other immigrants from Lithuania, the Czech Republic and Latvia.
Ireland's high standard of living, high wage economy and EU membership attract many[quantify] migrants from the newest of the European Union countries: Ireland has had a significant number of Romanian immigrants since the 1990s. In recent years, mainland Chinese have been migrating to Ireland in significant numbers (up to 10,000). Nigerians, along with people from other African countries have accounted for a large proportion of the non-European Union migrants to Ireland.
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