Complete Secularization: this definition is not limited to the partial definition, but exceeds it to "The separation between all (religion, moral, and human) values, and (not just the state) but also to (the human nature in its public and private sides), so that the holiness is removed from the world, and this world is transformed into a usable matter that can be employed for the sake of the strong". Sociological use and differentiation As studied by sociologists, one of the major themes of secularization is that of "differentiation"—i.e., the tendency for areas of life to become more distinct and specialized as a society becomes modernized. European sociology, influenced by anthropology, was interested in the process of change from the so-called primitive societies to increasingly advanced societies. In the United States, the emphasis was initially on change as an aspect of progress, but Talcott Parsons refocused on society as a system immersed in a constant process of increased differentiation, which he saw as a process in which new institutions take over the tasks necessary in a society to guarantee its survival as the original monolithic institutions break up. This is a devolution from single, less differentiated institutions to an increasingly differentiated subset of institutions. Following Parsons, this concept of differentiation has been widely applied. As phrased by José Casanova, this "core and the central thesis of the theory of secularization is the conceptualization of the process of societal modernization as a process of functional differentiation and emancipation of the secular spheres—primarily the state, the economy, and science—from the religious sphere and the concomitant differentiation and specialization of religion within its own newly found religious sphere". Casanova also describes this as the theory of "privatization" of religion, which he partially criticizes. While criticizing certain aspects of the traditional sociological theory of secularization, however, David Martin argues that the concept of social differentiation has been its "most useful element". Current issues in secularization At present, secularization as understood in the West is being debated in the sociology of religion. In his works Legitimacy of the Modern Age (1966) and The Genesis of the Copernican World (1975), Hans Blumenberg has rejected the idea of a historical continuity – fundamental to the so-called 'theorem of secularization'; the Modern age in his view represents an independent epoch opposed to Antiquity and the Middle Ages by a rehabilitation of human curiosity in reaction to theological absolutism. "Blumenberg