The legacy from Christianity unquestionably lies at the root of Europe, even if not exclusively. It has taken many aspects from the Middle Ages to modern times. If the Christian heritage is diversely understood and accepted within the European Union, the reason is essentially due to its political and religious significance. However, its impact in politics and religion has often been far from negative, if we will consider what secular societies have derived from Christianity: human rights, for example, and a religious affiliation which has been part and parcel of national identity. The Christian legacy has to be acknowledged through a critical analysis which does not deny the truth of the past but should support a European project built around common values.