This chapter deals with the exceptional case of immigrant religious assimilation in Greece. Within the European context of immigration countries characterised by ongoing secularisation process and immigrant assimilation towards natives’ values and attitudes, Greece is considered as a particular case because of the tendency of immigrants to assimilate towards stronger religious identities of natives. It is argued that such identities concern identification with the nation, which can be instrumental for immigrant’s acceptance and integration in the host society. This can be due to some peculiar characteristics of the Greek social, institutional and political setting which makes national identity and Orthodoxy so interwoven. By investigating the conditions in which such a “strategic assimilation” emerges, this chapter also examines whether the Greek case can be relevant for other countries across Europe, calling up for follow-up studies, especially about the role of religious socialization within-families.