In Religion and the Struggle for European Union , Brent F. Nelsen and James L. Guth delve into the powerful role of religion in shaping European attitudes on politics, political integration, and the national and continental identities of its leaders and citizens. Nelsen and Guth contend that for centuries Catholicism promoted the universality of the Church and the essential unity of Christendom. Protestantism, by contrast, esteemed particularity and...