Debates over the role of religion in contemporary European constitutional orders have increasingly shifted from the national to the European level, placing EU law and the jurisprudence of the Court of Justice under sharper scrutiny. In our view, despite imperfections in the CJEU’s case law, the external and differentiated role of the Court and of EU law can challenge claims of self-referential sufficiency. EU law provides a mirror and necessitates a dialogue in which these convictions are tested and, where necessary, redefined.