The book is devoted to consideration in a popular form of evolution of one of the most debatable creations of the Western European metaphysics - the ontological argument better known as the ontological argument of evidence for God's existence. The ontological argument is a logical nonsense for classical the subject - object relation; it becomes the natural phenomenon in the reflexive systems including cognitive activity of the subject as an element of the functioning and existence. The concept of classical and non-classical arguments has allowed the author to analyze argument development as process of formation of the reflexive methodology in the course of the Western philosophy development. From the standpoint of the received results, the methodological problems of economic science related to the alienation and also the reflexive paradoxes encountered within sociology of knowledge are analyzed in the last part of the book. The book is primarily addressed to specialists in the field history of philosophy and methodology of social knowledge, philosophy and sociology of religion, and also to all who are interested in fundamental questions of classical metaphysics.