The issue of interfaith marriage never seems to have come to a conclusion in the form of specific rules to accommodate this practice. Although the government through the Presidential Instruction has issued a compilation of Islamic law which contains rules prohibiting interfaith marriage, and is also supported by the MUI Fatwa which prohibits this practice, in reality, interfaith marriages always occur in society. It is undeniable that the courage of the people to continue to hold marriages is difficult to legalize, according to the 1974 UUP, partly because of the arguments of Muslim scholars who are pro in this practice. Therefore, this article will explore the arguments of pro and con groups on the issue of interfaith marriage and examine how society reacts to this issue. This article uses a library research method in which the data used is sourced from written text and analyzed philosophically. The results obtained from the analysis show that people who want to perform interfaith marriages, tend to continue to do so even though they know of the prohibition and are considered invalid by the 1974 UUP. This courage arises because of the arguments of pro group on interfaith marriages that are openly presented by Muslim scholars who carry liberal thinking, where they want to separate social life from religion.