Prior to the Roman occupation, the dominant religion in Wales was pagan, led by the druids. Little is known about the traditions and ceremonies, but it was known that they performed human sacrifice as described by Tacitus in AD 61, an altar on Anglesey was found to be "drenched with the blood of their prisoners". Christianity was introduced to Wales through the Romans, and after they abandoned the British Isles, it survived in South East Wales at Hentland. It the 6th century, it was home to Dubricius, the first celtic saint.
The largest religion in modern Wales is Christianity, with almost 58% of the population declaring to be Christian in the 2011 census. The Presbyterian Church of Wales was for many years the largest denomination and was born out of the Welsh Methodist revival in the eighteenth century and seceded from the Church of England in 1811; The Church in Wales had an average Sunday attendance of 32,171 in 2012. It forms part of the Anglican Communion, and was also part of the Church of England, but was disestablished by the British Government in 1920 under the Welsh Church Act 1914. Non Christian religions have relatively few followers in Wales, with Muslims making up 1.5% of the population while both Hindus and Buddists represent 0.3% each in the 2011 census. Over 32% of the population in Wales did not note a religion. Research in 2007 by the Tearfund organisation showed that Wales had the lowest average church attendance in UK at 12% of the population routinely attending.