Throughout European history, the relationship between religion and nationality has been varied and complex. Numerous times religion has been a bearer of national traditions and a nation has been a bearer of religious traditions, as can be seen in the Church’s conciliarism and the use of the Biblical image of Israel in Christian Hebraism. However, there have also existed sharp tensions between religion and nationality, as can be seen in how the New Testament has been understood and in Canon law. These variations must be accounted for. Why and how has religion both contributed to the consolidation and continued existence of a nation, and been disruptive of that consolidation and continued existence? When pursuing answers posed by these questions, a more accurate understanding of culture, religion, and nationality will be necessary by taking into account the distinction between unity and uniformity.