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Religion

In 2007 most of the inhabitants stated they are Roman Catholic (208 churches). In a 2011 survey conducted by InfoCatólica, 49.5% of Barcelona residents of all ages identified themselves as Catholic. This was the first time that more than half of respondents did not identify themselves as Catholic Christians. The numbers reflect a broader trend in Spain whereby the numbers of self-identified Catholics have declined. In 2019, a survey by Centro de Investigaciones Sociológicas showed that 53.2% of residents in Barcelona identified themselves as Catholic (9.9% practising Catholics, 43.3% non-practising Catholics).

The province has the largest Muslim community in Spain, 322,698 people in Barcelona province are of Muslim religion. A considerable number of Muslims live in Barcelona due to immigration (169 locations, mostly professed by Moroccans in Spain). In 2014, 322,698 out of 5.5 million people in the province of Barcelona identified themselves as Muslim, which makes 5.6% of the total population.

The city also has the largest Jewish community in Spain, with an estimated 3,500 Jews living in the city. There are also a number of other groups, including Evangelical (71 locations, mostly professed by Roma), Jehovah's Witnesses (21 Kingdom Halls), Buddhists (13 locations), and Eastern Orthodox.