Validation of the application of Usuli certitude in the inference of religious beliefs

The methodology of sciences plays a significant role in the knowledge of sciences and their practical application. One of the most important theological topics is the discussion about the method of inferring belief propositions and recognizing the effectiveness or ineffectiveness of suspicious evidence. Kamal al-Haydari is the first scientist who, considering it impossible to acquire logical certainty, spoke about the authority of Usuli certitude in religious beliefs and emphasized the sufficiency of probable encounters with religious knowledges. This article, with an analytical method and a critical approach, researches to investigate and evaluate the efficiency and validity of the use of Usuli certitude in religious issues. The basic question is, what is the relationship between Usuli certitude and religious beliefs, and can Usuli certitude be considered valid and effective in matters of belief? The findings of the research indicate that the Usuli certitude is not valid and efficient due to epistemological shortcomings and deficiencies in the inference of belief propositions and faces countless limitations such as: defect of discovery, personality of authenticity, defect of inclusion and delay in ranking of reasonability, this is despite the fact that the necessity of its authenticity in religious beliefs has several consequences such as: skepticism, relativism, pluralism, rejection of judgment and criticism and opinion, the necessity of distance and the influence of superstitious beliefs.