Today, the discussion or discourse about religious radicalization seem too excited and have been producing constructive ideas for strengthening the quality of religious life in Indonesia. In this discourse, emerging phenomena such as the followup acts of violence, terrorism and religious fundamentalism. The phenomenon is often used as the basis of various parties in the case to discuss the themes of religious radicalization. This study seeks to "clarify" the understanding of the issues and their religious radicalization crop. This study also reviewed the philosophical basis of the religious meaning of cedar potentialities of religion and religiosity of his. Ultimately, this study has relevance and is seen to be contributing to the problem of religious life in Indonesia, primarily by looking at the concept of multicultural education. Keywords: radicalization, the shallowness of religion, the depth of religion, religiosity, multicultural education