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In page European Union:

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According to new polls about religiosity in the European Union in 2015 by Eurobarometer, Christianity is the largest religion in the European Union, accounting for 71.6% of the EU population. Catholics are the largest Christian group, accounting for 45.3% of the EU population, while Protestants make up 11.1%, Eastern Orthodox make up 9.6%, and other Christians make up 5.6%.[4]