The term "Religious Philosophy" refers to the long-established and valuable historical philosophical thought which, in various forms, has been showing vitality to this day, whereas as a theory, it denies the post-renaissance approach to the relationship between the religion and philosophy and it points to the intertwining of these two cognitive heritages. Author of this article will put Islamic philosophy in the limelight and focus on its originality. When reading various theories on the essence of Islamic philosophy which, regardless for its content, some thinkers called Arabic, it's rarely possible to find an example where they have described the two Islamic and philosophical distinctiveness of that philosophy, side by side. Hence, majority of the existing definitions and descriptions of Islamic philosophy seek to determine the truncated main postulates of Islamic philosophical thought, whereas in the end it is the absolute originality of Islamic philosophy that is called into question. In this article, author tries to clarify the theoretical assumptions that are necessary for understanding the specifics of Islamic philosophy, completely, so that we can conceive and describe the philosophy that is at the same time - philosophical and Islamic.