The country has an area of 32,369 square miles and a population of 8.3 million. During previous reporting periods the country experienced some immigration from countries such as Turkey and Bosnia-Herzegovina, which increased the number of Muslims. The Muslim community more than doubled between 1991 and 2001 to 339,000, or 4.2 percent of the population. Estimates for 2008 indicate that there are approximately 400,000 Muslims in the country. Immigration has slowed down due to the gradual introduction of a quota system in the late 1990s.
According to the 2001 census, membership in major religious groups is as follows: Roman Catholic Church, 74 percent; Lutheran and Presbyterian Churches (Evangelical Church-Augsburger and Helvetic confessions), 4.7 percent; Muslim community, 4.2 percent; Eastern Orthodox (Russian, Greek, Serbian, Romanian, and Bulgarian), 2.2 percent; other Christian churches, 0.9 percent; Jehovah's Witnesses, 0.3 percent; other non-Christian religious groups, 0.2 percent; and Jewish community, 0.1 percent. Atheists account for 12 percent, and 2 percent do not indicate a religious affiliation.
According to a poll by the German market research institute FESSEL-GfK conducted in June and July 2007, 81 percent of respondents stated that they belong to a church or religious group. Of that number, 2 percent attend services more than once a week, 10 percent attend weekly, 9 percent attend a minimum of once a month, 26 percent attend several times a year (on special occasions), and 53 percent rarely attend.
The provinces of Carinthia (10.3 percent) and Burgenland (13.3 percent) have higher percentages of Protestants than the national average of 4.7 percent.
A large number of immigrants come from the Balkans and Turkey, and these groups are largely Orthodox and Muslim respectively. The number of Muslims is higher than the national average of 4.2 percent in Vienna (7.8 percent) and the province of Vorarlberg (8.4 percent), where industry draws a disproportionately higher number of guest workers from Turkey and the former Yugoslavia.
The vast majority of groups considered "sects" by the Government are small organizations with fewer than one hundred members. Among the larger groups is the Church of Scientology, which claims between 5,000 and 7,000 members, and the Unification Church, with approximately 700 adherents. Other groups termed "sects" include Divine Light Mission, Eckankar, Hare Krishna, the Holosophic Community, the Osho Movement, Sahaja Yoga, Sai Baba, Sri Chinmoy, Transcendental Meditation, Center for Experimental Society Formation, Fiat Lux, Universal Life, and The Family.