This article explores the Christendom landscape in Veneto region, and focuses on immigration’s impact on Christian congregations. The first section describes the current sociological debate on congregational studies, relating it to the topic of reli-gious diversity through the last researches. The second and third sections, instead, describe from a quantitative perspective the recent trends within religious diversity in Italy. They offer the latest estimates available on the main religious traditions established in the Italian peninsula, and on the religious affiliation of immigrant population to the different Christian churches. Finally, section four focuses on the case of Christendom in Veneto. It proposes through a quantitative survey a "map" of congregations of the three main branches of Christianity in this region (Catholi-cism, Eastern Orthodoxy, and the Protestant world). The results show the key as-pect and the impact of immigrant groups in promoting a pluralization of Christian-ity and influencing its congregations’ establishment.
Keywords: Congregations; Christianity; religious diversity; immigration and reli-gion; Italian Catholicism; Veneto.