More than 60 percent of Berlin residents have no registered religious affiliation. As of 2010, at least 30 percent of the population identified with some form of Christianity (18.7 percent Protestants, 9.1 percent Catholics and 2.7 percent other Christian), approximately 8.1 percent were Muslim, 1 percent were Jewish, and 1 percent belonged to other religions.^{[2][failed verification]} As of 2022, the number of registered church members has shrunk to 15 percent for EKD Protestants and 9 percent for Catholics.^[3]

As of April 2009, 64 percent of Berlin residents have no registered religious affiliation. For this reason, Berlin is sometimes called the "atheist capital of Europe."^[4]

On 26 April 2009, a referendum (de) was held on whether Berlin pupils should be allowed to choose between the ethics class, a compulsory class introduced in all Berlin schools in 2006, and a religion class.^[5] The SPD, the Left Party and Greens supported the "Pro Ethics" camp for a "No" vote, stressing that the ethics class should remain compulsory, and pupils could voluntarily take an extra religion class alongside it if they so chose; the CDU and FDP supported the "Pro Reli" camp for a "Yes" vote, wanting to give pupils a free choice.^[5] In East Berlin, an overwhelming majority voted against the introduction of religious education.^[5] In total, 51.5 percent voted "No" and 48.4 percent voted "Yes".^[5]

There are a number of humanist groups in the city. The Humanistischer Verband Deutschlands (English: Humanist Association of Germany) is an organization to promote and spread a secular humanist worldview and an advocate for the rights of nonreligious people. It was founded 1993 in Berlin, and in 2009 according to the group it counted about 4100 members in the city.^[6]

In 2009, Islamic religious organizations in Berlin reported 249,000 members.^[8] As of the end of 2015, 352,667 officially registered residents of Berlin had immigrated after 1955 from Arabic and Islamic countries, the largest part from Turkey, or were children of such immigrants.^[9]

The Berlin Mosque (German: Berliner Moschee, Wilmersdorfer Moschee, Ahmadiyya Moschee) in Berlin is Germany's oldest mosque in use, situated on Brienner Straße 7–8 in Berlin-Wilmersdorf. It was designed by K. A. Hermann and was built between 1923 and 1925. It has two 90 feet (27 m) tall minarets.

The Sehitlik Mosque in Neukölln built in 1983 serves as a cultural center as well as a place of worship. It can hold up to 1,500 people, and is the largest Islamic mosque in Berlin.^[10]

Of the estimated population of 30,000-45,000 Jewish residents in 2014,^[12] approximately 12,000 are registered members of religious organizations.^[7] Berlin is considered to have one of the rapidly growing Jewish communities in the world due to Russian, Eastern European, Israeli and German Jewish immigrants.^[13][14]

The Centrum Judaicum and several synagogues—including the largest in Germany—have been renovated and reopened in 2007.^[15] Berlin's annual week of Jewish culture and the Jewish Cultural Festival in Berlin, held for the 21st time in the same year, featuring concerts, exhibitions, public readings and discussions partially explain why Rabbi Yitzhak Ehrenberg of the orthodox Jewish community in Berlin states: "Orthodox Jewish life is alive in Berlin again." ^[16][17]

The Neue Synagoge ("New Synagogue") was built 1859–1866 as the main synagogue of the Berlin Jewish community, on Oranienburger Straße. Because of its refined Moorish style and resemblance to the Alhambra, it became an important architectural monument of the second half of the 19th century in the city.

In 1924 Dr. Paul Dahlke established the first German Buddhist monastery, the "Das Buddhistische Haus" in Reinickendorf. It is considered to be the oldest and largest Theravada Buddhist center in Europe and has been declared a National Heritage site.^[18]

There are many places of worship in Berlin for the variety of religions and denominations. For example, there are 36 Baptist congregations (within Union of Evangelical Free Church Congregations in Germany), 29 New Apostolic Churches, 15 United Methodist churches, eight Free Evangelical Congregations, four Churches of Christ, Scientist (1st, 2nd, 3rd, and 11th), six congregations of the Church of Jesus Christ of Latter-day Saints (Mormons), an Old Catholic church and even an Anglican church. The Independent Evangelical Lutheran Church has eight parishes of different sizes in Berlin.^[19] Berlin has more than 80 mosques,^[20] as well as two Buddhist and three Hindu temples.

Over the past years, Berlin has seen a considerable increase in interfaith initiatives, including the House of One project which looks at building a joint place of worship for adherents to different religions. In 2016, Berlin celebrated its first ever Interfaith Music Festival ("Festival der Religionen") which was organised by the international non-profit initiative Faiths In Tune and made possible with funds from the Berlin Lottery Foundation.

The Festival der Religionen combined live music and dance performances by artists from 13 different religions, an interfaith fair and several exhibitions on faith subjects.^[21][22][23]

• Religion in Germany