Freedom of religion and worship is guaranteed in Austria. About three-fourths of Austrians are Roman Catholic. Many Austrians practice "baptismal certificate Catholicism," in which they are Catholic by baptism and religious formality but do not hold Catholic beliefs on central issues. Another major religion in Austria is Protestantism, and many foreign workers are Muslim or Serbian Orthodox. There is also a small community of Jews, mostly post World War II immigrants and their families, although the Jews have a long history in Vienna, beginning in the tenth century.