Religion is a set of practices and beliefs shaping the relationship between men and the sacred. It always has an influence on the people and in particular on their perception. This paper is about the perception of Muslim hosts on western mass tourism, using the tourist island of Gili Trawangan in Indonesia as a case study. The main purpose of the study is to show how the beliefs and practices of the Islamic religion of the local community influences the perception of the impacts of tourism. The results show a certain tolerance and acceptance of Western tourism by the local Muslim community, characterized as having a strong religious belief and a level of practice that varies from one individual to another.