Icelanders enjoy freedom of religion under the constitution, though the National Church of Iceland, a Lutheran body, is the state church. The National Registry keeps account of the religious affiliation of every Icelandic citizen. In 2005, Icelanders were divided into religious groups as follows:[76]
* 80.7% members of the National Church of Iceland.
* 6.2% members of unregistered religious organisations or with no specified religious affiliation.
* 4.9% members of the Free Lutheran Churches of Reykjavík and Hafnarfjörður.
* 2.8% not members of any religious group.
* 2.5% members of the Roman Catholic Church, which has a Diocese of Reykjavík (see also Bishop of Reykjavík (Catholic)).
The remaining 2.9% includes around 20–25 other Christian denominations while around 1% belong to non-Christian religious organisations. The largest non-Christian denomination is Ásatrúarfélagið, a neopagan group.[77]
Religious attendance is relatively low,[78][79] as in the other Nordic countries. The above statistics represent administrative membership of religious organisations which does not necessarily closely reflect the belief demographics of the population of Iceland. According to Froese (2001), 23% of the inhabitants are either atheist or agnostic.
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