One of the most challenging issues raised in the theology and philosophy of religion is to define the concept of religion and its main components. This study aims to criticize and analyze the strengths and weaknesses of a definition of religion presented in "Reason and Religious Belief". The results show that the main strength of this definition is that it considers "beliefs", "actions", and "emotions", which are among the existential needs and abilities of humans. However, some weaknesses of this definition are as follows: 1- Difficulty in achieving common points between religions, 2- Ambiguous explanation of the main elements of the definition, 3- Inclusion beyond the definition, and 4- Inattention to specific and individual features in the definition of religion. It is noteworthy that one of the main challenges in defining the concept of religion is the necessity of a systemic approach. In addition, such an approach should be viewed based on methodological conditions.
