Nowadays, some people are trying to prove that being a modern European and a person practicing religion in the same time is not possible. It is declared that religiosity and Europeanism are mutually exclusive. The author of this study does not agree with such thesis and through this study tries to prove that being a religious man and being a modern citizen of the European Union is possible, and even more, those two ideas - European integration and religiosity are complementary. The objective of this study is to analyze the interaction between the idea of integration in the European Union and religion. Due to the limited scope of this work and also the author’s interest, the area of religion will be narrowed down to the Roman Catholic religion. The aim is to show that Europe has Christian roots and at the base of the European integration lie the same principles that are promoted by the Catholic Church. In addition, the Catholic Church position towards the European Union will be presented.