The population of Turkey is predominantly Muslim (99%), the majority are Sunni (75%) and a large minority are Alevi (15-25%). The remainder of the population are mainly Christians (mostly Greek Orthodox and Armenian Apostolic) and Jewish (96% Sephardi and 4% Ashkenazi.) Based on a nationwide survey in 2007 it found, 96.8% have a religion while, 3.2% were non-religious and atheists, and the more regularly practiced acts of worship is fasting (83%) and going to friday prayers (56%). According to a Pew Research Center report in 2002, 65% of the people in Turkey believe "religion is very important", while according to a Eurobarometer poll in 2005, 95% of Turkish citizens responded that they believe "there is a God". Turkey is officialy a secular republic, with no official state religion; the Turkish Constitution provides the freedom of religion and conscience, and does not represent a religion.
- Bureau of Democracy, Human rights and Labor - International Religious Freedom Report 2007- Turkey
- Shankland, David (2003). The Alevis in Turkey: The Emergence of a Secular Islamic Tradition. Routledge (UK). ISBN 0-7007-1606-8.
- "An Overview of the History of the Jews in Turkey" (PDF). American Sephardi Federation. 2006. Retrieved 2008-10-19.
- United Nations Population Fund (2006). "Turkey - A Brief Profile". United Nations Population Fund. Retrieved 2006-12-27.
- Country Profile: Turkey, August 2008 - Library of Congress – Federal Research Division
- KONDA Research and Consultancy - Religion, Secularism and the veil in daily life.
- Turkish Daily News - Poll finds Turks oppose headscarf ban in universities
- "Pew Global Attitudes Project: Religion is very important". Retrieved 2002-12-19.
- Eurobarometer Poll, 2005
- ICL - International Constitutional Law - Turkey Constitution
- "Turkey: Islam and Laicism Between the Interests of State, Politics, and Society" (PDF). Peace Research Institute Frankfurt. Retrieved 2008-10-19.