This article considers the justification of laws to religious citizens. It does via a consideration of the debate surround the teaching of Intelligent Design. It argues that one widely held view of political morality, public reason liberalism, requires that schools should allow teaching ID. This is contrary to the views of many defenders of this theory. I show that this argument reveals a deep problem with public reason liberalism, and that it undermines the judgement of the court in the high profile case of Kitzmiller vs Dover.