Religion
The urban landscape of Istanbul is shaped by many communities. The religion with the largest community of followers is Islam. Religious minorities include Orthodox Christians, Armenian Christians, Catholic Levantines and Sephardic Jews. According to the 2000 census, there were 2,691 active mosques, 123 active churches and 26 active synagogues in Istanbul; as well as 109 Muslim cemeteries and 57 non-Muslim cemeteries. Some districts used to have sizeable populations of these ethnic groups, such as the Kumkap district, which had a sizeable Armenian population; the Balat district, which had a sizeable Jewish population; the Fener district, which had a sizeable Greek population; and some neighbourhoods in the Nianta and Beyolu districts that had sizeable Levantine populations. Very few remain in these districts, as they either emigrated or moved to other districts. In some quarters, such as Kuzguncuk, an Armenian church sits next to a synagogue, and on the other side of the road a Greek Orthodox church is found beside a mosque.
The seat of the Ecumenical Patriarch of Constantinople, patriarch of the autocephalous Greek Orthodox Church, is located in the Fener (Phanar) quarter. Also based in Istanbul are the archbishop of the Turkish Orthodox Church, an Armenian archbishop, and the Turkish Grand-Rabbi. A number of places reflect past movements of different communities into Istanbul, most notably Arnavutköy (Albanian village), Polonezköy (Polish village) and Yenibosna (New Bosnia).The Muslims are by far the largest religious group in Istanbul. Among them, the Sunnis form the most populous sect, while a number of the local Muslims are Alevis. In 2007 there were 2,944 active mosques in Istanbul