After 911, Jürgen Habermas becomes very interested in discussing religious issues, and he starts to have talks with theologians and people in the field of religions. Some people even think Habermas has a kind of ”religious turn” recently in his thoughts lately. However, this article disagrees with such assessment. Tracing Habermas' Theory of Communicative Action which summarized the process of western rationalization in early days to the recent idea of ”post-secular society” in his thoughts, Habermas never gives up or changes his attitude of rationality. Nevertheless, the world becomes more influenced by religions and this makes Habermas cannot deny the power of religions. Thus he decided to deal with religious issues apropos the project of enlightenment. This is the issue described in the ”post-secular society” relating to ”translation” and ”the thrust of reflection”.