The aim of this study is presented by two steps. The first is to gain an insight into what students think regarding sustainable development and religion. The second is to investigate what content in sustainable development can be used in religious studies through the students' perspective and how this content can be implemented to promote the work for sustainable development in schools. Seventeen qualitative semi-structured interviews with mainly open questions are performed. The focus is to get information about how Swedish high school students reason about and reflect on sustainable development and how they reflect on its connection to religion and to religious studies. The empirical result is analysed and discussed. The conclusions show that the respondents wish a sustainable society with a lifestyle without excessive consumption and thereby without environmental problems, with security and with a good education. They emphasize the importance of a meaningful, safe, and challenging education on religious studies. They are willing to discuss in depth and with respect for the different opinions that may emerge, about different perceptions of sustainable development that are related to the different identities and ways of religious lifestyles. This can be achieved through a communicative approach in the classroom, with a goal to create the dialogic classroom