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In the paper the proposition on the repression of the awareness of the existence of the devil from modern social science, philosophy and theology is discussed. The figure of devil is prominent in Max Weber’s description of rationalization and differentiation process of autonomic „spheres of life”. The author presents Niklas Luhmann’s characteristics of autonomy of religion subsystem in modern functional differentiated society as a revision of social differentiation theory based on actors’ motivations presented by Weber. In this perspective the demonic features of enlightenment sociology are indicated as well as Luhmann’s desiderata of its overcoming: abandonment of critical stance practiced by sociology and resignation from moralization of social reality.