Vienna is the seat of the Roman Catholic Archdiocese of Vienna; its current Archbishop is Cardinal Christoph Schönborn. According to the 2001 census, 49.2% of Viennese are Roman Catholics, while 25.7% are of no religion, 7.8% are Muslim, 6.0% are members of an Orthodox denomination, 4.7% are Protestant (mostly Lutheran), 0.5% are Jewish, and 6.3% are either of other religions or did not reply.
Many Roman Catholic churches in central Vienna feature performances of religious or other music, including masses sung to classical music and organ. Some of Vienna's most significant historical buildings are Roman Catholic churches, including the Stephansdom (St. Stephen's Cathedral), the Karlskirche (St. Charles' Church) and the Votivkirche.
The proportion of Viennese who identify as Roman Catholic has dropped over the last fifty years, from 90% in 1961 to 39.8% in 2010