The way in which immigrants' cultural identities change over time and under the influence of the larger society, as do the characteristics of the relationship between them, are generally crucial issues in the study of second generations' integration processes. For children of immigrants rejoining their parents who emigrated before them, this process is more complex because it overlaps with the larger developmental task of identity formation, which started in their home countries and then continued in the receiving society. The outcome of this process mirrors the various possible acculturation attitudes. Adolescents and young people can choose among various options: if they don't solve the cultural identity issues that they face, they may exhibit identity diffusion. They acquire within the family the adaptive patterns of behaviour, personal characteristics, values, and social responses expected of them in their heritage culture. Religiousness, religious belonging, and the way of being religious are issues at the crossroads of sociological and psychological sciences. Indeed, there was clear evidence of the importance of religion in how immigrants engaged in both their intercultural relations and their integration paths. In this framework, the chapter discusses whether the second generation of Muslims in Italy experiences secularisation (in the sense of a decline in the importance and impact of religion), or rather religious revival (in the sense of a reinvention or reinvigoration of religious traditions in the migration context), or more, i.e. radicalisation attitudes. To this end, the chapter – thanks to 80 qualitative interviews collected in various Italian cities – examines the outcome of religious socialisation in terms of religious identity (e.g. values and attitudes) and religious involvement in the public arena.