One important factor enabling Islamophobia, radicalism has been a global issue endangering personal safety and public security. It is strongly associated with incorrect understanding of religious doctrines. This paper aims to present a critique of the religious paradigm promoted by the radical groups from the principles of Islamic jurisprudence (ushul fiqh) perspective. Using an epistemological analysis to uncover the nature of their religious understanding and its justification, this study argues that the radical religious paradigm is characterized by a monolithic, textual, and rigid interpretation of the sacred texts. According to the radical groups, the sources of Islamic laws or teachings are restricted to only the Qur’an and the hadith, leaving no space for alternative interpretations. They do not give place for ra’yu (reason) in determining the laws or teachings. On the other hand, ushul fiqh perspective maintains that the sources of the Islamic laws or teachings are not restricted to only the two said sources; it also gives place for ra’yu (reason). The sources can also be found in the form of isyarah (signaling) and ruh (spirit) of the Qur’an and the hadith. In this sense, ushul fiqh refuses the literal interpretation proposed by the radical groups since not all of the texts in the Qur’an and the hadith can be understood literally. Taken together, these findings strengthen the idea that incorrect understanding of religious doctrines helps lead to the absolute, puritanical, and intolerant stance towards differences.