The biggest religious organization in Iceland in 2023 was the Evangelical Lutheran Church of Iceland, with more than 227,000 members. Ranked second was the Roman Catholic Church with about 15,000 members. Moreover, 73,000 had another religious stance or did not state their life stance, and 30,000 did not belong to any religious organization.

In Iceland, nearly 60 percent of the population were members of the Evangelical Lutheran Church of Iceland, making it the religious organization in the country with the highest share of members. Moreover, nearly one fifth of the population belonged to other organizations or did not specify their community, while eight percent did not belong to a religious organization.

Iceland: Christians as percent of the total population: The latest value from is percent, unavailable from percent in . In comparison, the world average is 0.0 percent, based on data from countries. Historically, the average for Iceland from to is percent. The minimum value, percent, was reached in while the maximum of percent was recorded in .

Islande: Non religious people as percent of the population: Pour cet indicateur, The Cline Center for Democracy fournit des données pour la Islande de à . La valeur moyenne pour Islande pendant cette période était de pour cent avec un minimum de pour cent en et un maximum de pour cent en .