The binary division between ‘religion’ and ‘secular’ as an analytical tool has long been criticised within the research field of ‘critical religion’ in religious studies. There has also been a parallel critique in the academic discussion about post-secularity. Recently, sociologists have picked up and deepened this criticism, as expressed in Mitsutoshi Horii’s book ‘Religion’ and ‘Secular’ Categories in Sociology: Decolonizing the Modern Myth (2021). Based on a critical processing of Horii’s application to sociology, the aim of this article is to discuss the challenges for non-confessional religious education (RE) that the ongoing dismantling of this binary division entails. In particular, it looks at how a non-confessional RE could be designed that transcends the binary division and how powerful knowledge could be understood in a non-binary context.