This article investigates the relationship between integration processes and religious participation through an analysis of migrant churches established in the city of Milan. While in Europe most public opinion and literature are focused on Islam, and religion is often viewed as an impediment and barrier to integration, this work wants instead to discuss the ways in which religion serves migrants’ needs in the receiving society, acting as a social bridge. Combining qualitative data collected in six Christian migrant churches, three Catholic and three Protestant, the article explains how religious communities have become significant urban hubs for immigrants, providing opportunities to socialize, developing welfare services, supplying places for family activities, as well as moral guidance in a diverse society. By detailing the practical and social functions of churches, this article shows how religion represents an alternative and mediating force, able to support migrants’ integration – a role which is still understudied in Europe.