The purpose of this paper is to empirically explore and theoretically discuss Swedish religious studies (RE) teachers' understanding of religions as similar and different. In Sweden, RE is a mandatory subject and presents all the world's major religions to students. Teachers of RE therefore need to relate to the various relations between the religions. A qualitative interview study with Swedish RE teachers (n?=?7) in Swedish secondary schools was performed to determine how they conceptualise religion and present "religion" to their students. The teachers (m?=?3; f?=?4) were chosen from schools with a variety of ethnically homogenous and heterogeneous compositions of students. The teachers' conceptions of "religion" can be described according to two main categories: as something universal or as something dependent on the cultural context. These two main orientations are described more closely in this paper. The teachers' conceptions are also discussed from the perspective of possible consequences for educating citizens in the Swedish school system. It is suggested that RE teachers' conceptions of religions as similar and different facilitate and constrain identification and encounters with others as religious subjects.