Climate change has created a sense of global kinship and increased levels of religiosity. People have an obligation to manage natural and environmental resources by adapting to climate change. Environmental management is essentially based on two factors, namely reducing environmental risk and increasing environmental benefit. This article describes the sustainability of ecotourism developments, the development of ecotourism in Genilangit based on participation, the management of ecotourism in Genilangit based on a stimulus of religious ecology, and the strategies of the mountainside community for adapting to climate change. The research uses a qualitative method with a case study, which aims to gain a deep understanding of the attitudes and behaviour of the community with regard to religious ecology in developing ecotourism sector as an adaptation strategy to climate change. The results of the research show that ecotourism in Genilangit is “Green and Fair” in its concern for sustainable development and conservation, in aspects of economic sustainability, social sustainability, and environmental sustainability. Ecotourism in Genilangit is community based, and the principle of religious ecology is always implemented as the basis for managing ecotourism which is adaptive to climate change. The success of the Genilangit community in adapting to climate change is due to their social and cultural adaptations which are implemented within a framework of religious ecology.