Theology, Philosophy of Religion and Kalam

Among various sciences, especially in the realm of religious studies, some have close relations from the aspects of subject- matter, method and domain, to the extent that some think of them as one science, although they each have a distinct and independent title. In the realm of religious studies, sciences such as theology, philosophy of religion and first philosophy are among these sciences and their topics are sometimes confused during researches. Therefore, in the present research I am trying to show the boundaries between these sciences, and their differences and similarities.To determine the domain of each of these sciences, first I discuss theology and its related problems. Then I explain the similarities and differences between this science, first philosophy and philosophy of religion. Moreover, in each of these sciences, we will present the differences between them and their subsets.