Religion in Italy has been historically characterised by the dominance of the Catholic Church, the largest branch of Christianity, since the East–West Schism.[5][6] This is in part due to the importance of Rome in the history of the Church, including its historical status as a leading patriarchate and the presence of the Vatican, the Catholic Church's headquarters and the residence of the Pope—the Bishop of Rome—within its borders (presently as an enclave). However, due to immigration, notably the influx of Muslims, Eastern Orthodox Christians, Protestants, Buddhists and Hindus, as well as proselytism and secularization, religious pluralism in Italy has increased in the 21st century. Italy also features a pre-Christian Jewish community, an autochthonous Protestant church–the Waldensian Evangelical Church and one of the largest shares of Jehovah's Witnesses in the world.