The Constitution of Azerbaijan provides that persons of all faiths may choose and practice their religion without restriction; however, some sources state that there have been some abuses and restrictions. Some religious groups reported delays in and denials of registration. As in previous years, there continued to be some limitations upon the ability of groups to import religious literature. Most religious groups met without government interference; however, local authorities monitored religious services, and officials at times harassed and detained members of "nontraditional" religious groups. There were some reports of societal abuses or discrimination based on religious belief or practice. The US. State Department reported prejudice against Muslims who convert to other faiths and hostility toward groups that proselytize, particularly evangelical Christian and other missionary groups, as well as Iranian groups and Salafists, who are seen as a threat to security.
The country has an area of 33,774 square miles (87,470 km2) and a population of 9.2 million (2012). There were no reliable statistics on membership in specific religious groups; however, according to official figures approximately 96 percent of the population is Muslim. The remainder of the population consists mostly of Russian Orthodox, Armenian Apostolic (Almost all of which live in the break-away region of Nagorno-Karabakh), Jews, and nonbelievers. Among the Muslim majority, religious observance is relatively low, and Muslim identity tends to be based more on culture and ethnicity than religion. According to the State Committee on Work with Religious Associations (SCWRA), the Muslim population is approximately 85 percent Shi'a and 15 percent Sunni; traditionally, differences are not defined sharply. In a 2011 report, the U.S. Department of State puts the number as 65 percent Shia and 35 percent Sunni.
The vast majority of Christians are Russian Orthodox. According to the U.S. Department of State, their "identity, like that of Muslims, tends to be based as much on culture and ethnicity as religion". Christians were concentrated in the urban areas of Baku, which is the nation's capital, and Sumgayit, its third-largest city.