This paper examines the theological and sociopolitical implications of ethnic boundary crossing in the Gospels’ narratives of Gentile inclusion and their resonance with postcolonial African Christianity’s struggles to navigate ethnic fragmentation. Drawing on postcolonial hermeneutics, social identity theory, and comparative case studies, the study argues that the Gospels’ subversion of ethno-religious exclusivity offers a transformative framework for reimagining Christian identity in Africa, where colonial legacies and tribal divisions persist. Through analysis of key Gospel texts (e.g., Mark 7:24–30, Acts 10:1–48) and African contexts (e.g., post-genocide Rwanda, apartheid South Africa), the paper demonstrates how early Christian boundary-breaking practices parallel contemporary African efforts to reconcile ethnic diversity with communal belonging. However, it also critiques the limitations of this analogy, particularly the tension between Western-derived missionary theology and indigenous African cosmologies. The findings reveal that inclusive ecclesial practices, such as vernacular liturgies and grassroots reconciliation initiatives, can mediate ethnic divides when rooted in decolonial hermeneutics. This research contributes to global theological debates on identity and inclusion, offering practical insights for churches in pluralistic societies.