Irreligion in Estonia pertains to atheism, agnosticism, and secularism of the people and institutions of Estonia. Irreligion is prominent in Estonia, where a majority of citizens are unaffiliated with any religion. Estonian irreligion dates back to the 19th century, when Estonian nationalists and intellectuals deemed Christianity a foreign religion in opposition to Estonian independence. Irreligion in Estonia was later accelerated by the Soviet occupation of the Baltic states, in which state atheism was enforced. By some metrics, Estonia is the most irreligious country in the world.