Which religion prevails in Bulgaria?

Religion in Bulgaria has been dominated by Christianity since its adoption as the state religion in 865. The dominant form of the religion is Eastern Orthodox Christianity within the fold of the Bulgarian Orthodox Church. During the Ottoman rule of the Balkans, Sunni Islam spread in the territories of Bulgaria, and it remains a significant minority today. The Catholic Church has roots in the country since the Middle Ages, and Protestantism arrived in the 19th century.

The Constitution of Bulgaria designates Orthodox Christianity as the "traditional" religion of the country, but guarantees the free exercise of any religion. Bulgaria has not experienced any significant ethnic or religious confrontation, unlike the case in former Yugoslavia in the 1990s. The religious communities in the country coexist peacefully. In fact, the capital Sofia is known for its so-called Square of Religious Tolerance; the St Nedelya Church, St Joseph Cathedral, Banya Bashi Mosque and Sofia Synagogue are located within meters of each other in the very center of the city.