This article arises out of work undertaken within the After Religious Education project. It synthesizes the curriculum expertise of established researchers, with the expertise of current teachers of RE in England. A question drives our shared interests: how should we approach curriculum development in RE and how do we justify the approach taken? The article proceeds in three steps. First, we elaborate, contextualize, and justify this question by introducing varied approaches to the curriculum production in RE. We argue that these approaches lack a foundational influence from general didactics: an understanding of subject matter that is informed by distinctively educational theory. Addressing this omission, the second step presents an alternative approach to RE established on the 'Bildung/didactic' tradition, and the specific general didactic analysis of Klafki. Third, we explore this approach in relation to two teaching contexts, modelling these applications, and the principles they exemplify. We demonstrate the value of synthesizing theoretical and practical expertise for RE theory and practice.