According to the Swiss Federal Statistical Office, based on cumulative data collected between 2013 and 2017, there were significant differences in the religious affiliations of the five most common ethno-national groups in Switzerland: Swiss nationals were mostly Christians (73%), evenly divided between Catholics (37%), Swiss Protestants (31%) and other Christians (5%); the vast majority of Italian and Portuguese nationals living in Switzerland were Catholics (77% and 74%, respectively); half of German nationals in Switzerland were unaffiliated, while Christians were minority accounting for 47%; and Frenchmen in Switzerland were mostly unaffiliated (55%), while only 38% of them were Christians.
