Having taken the reader through the rapidly evolving political and religious landscape of three major Western democracies, in its two concluding chapters this book returns to the key questions raised in the Introduction. Thus, Chapter 16 moves from the specifics to the general and seeks to assess the insights from each case study from a comparative perspective, discussing common and distinct patterns. As it goes through each of the research questions it distils four conclusions that can serve as cornerstones for a more general theory of the dynamics between religion, populism and right-wing identity politics. The first is that right-wing populists’ success has often been a response to a democratic lack of representation of the new identity cleavage in the cases studied. The second is that right-wing populists’ references to Christianity is part of a new white identity politics, in which Christianity serves as a civilisational marker of belonging, rather than a source of religious believing. The third is that there is often a potential for religious immunity against right-wing populist appeals. The fourth is that the existence or strength of this immunity is shaped by the behaviour of mainstream parties and faith leaders who can play an immense role in shaping national populists’ ability to redefine and re-politicise religion in German, French and US politics.