There have been wide-ranging discussions on the religiousness of Confucianism in the past century. The rational humanism occupied the mainstream for quite long time. In the context of rational humanism, many philosophers and sociologists regard the religiousness of Confucianism as remains. Mou Zongsan proposes the theory of “immanent transcendence” to explain the “unity of heaven and man.” For negative or positive purposes, some scholars consider Confucianism as a religion. Meanwhile, many others offer different interpretations: Confucianism only has ultimate concern in either social or personal practice. Tu Weiming proposes “spiritual humanism” to draw a clear distinction from “secular humanism.” He also points out that “immanent transcendence” and “external transcendence” can develop independently and should engage in meaningful cultural dialogue.