After the Second World War, the establishment of the future European Union and the accession of the European states to the Union has made, from the beginning, a fundamental question on the ideal of the conscience and religious freedom that wants to promote the new socio-religious political conjuncture the world. This thorny question will be addressed to the Christian denominations in the Western and Eastern side of Europe which will feel directly responsible to the new face of Europe, from the perspective of the common and Christian good, preached by the Gospel of the Savior of the world, Jesus Christ. The efforts will be an extension of their positive cultural contribution of Athens and ancient Rome; if Athens gave to the European culture the concept of the Individual and ancient Rome gave the concept of the Citizen of the city, the Christianity, brought by Jesus Christ, will give a new vision, including this on the New Europe, which starts a (re)updating of the concept Person . This concept covers the size of the universal con-science religious liberty of the human, of which we'll talk from a personal perspective on the Trinitarian-model theology of the Trinity, and, on the other side, about the Christological-ecclesiological model, in terms of the diversity of the identity and on the multiplicity in unity. From this perspective, the two models will be an existential order itself on human searches, seen not as an individual tragic figure masks, but as a person, from the historical reality of Jesus Christ for all times. He will bring to the world not only the revelation of Himself, but also the teachings about the Person who becomes the foundation for the development and depiction of man, the image of the Image of God in history .