Religion has been a major influence on the societies, cultures, traditions, philosophies, artistic expressions and laws within present-day Europe. The largest religion in Europe is Christianity. However, irreligion and practical secularisation are also prominent in some countries. In Southeastern Europe, three countries (Bosnia and Herzegovina, Kosovo and Albania) have Muslim majorities, with Christianity being the second-largest religion in those countries. Transcontinental nations between Europe and Asia also have muslim majorities, such as Turkiye and Azerbaijan, or large muslim minorities, such as Cyprus (including a de facto majority in the generally unrecognised Northern Cyprus) and Georgia.
Little is known about the prehistoric religion of Neolithic Europe. Bronze and Iron Age religion in Europe as elsewhere was predominantly polytheistic and included Ancient Greek religion, Ancient Roman religion, Slavic paganism, Finnish paganism, Celtic polytheism and Germanic paganism. Modern revival movements of these religions, and religions influenced by them, include Heathenism, Rodnovery, Romuva, Druidry, Wicca, and Hetanism.