This is how a community of pacifist christ followers turned into murdering machines. They where without violence untill the emperor decided he would become the capi de capi of the roman church. The rest we know.
All for the pope who was a pagan roman emperor
Church of the Roman Empire (313–476)
Galerius, who had previously been one of the leading figures in persecution, in 311 issued an edict permitting the practice of Christianity.
Constantine the Great
The Emperor Constantine I was exposed to Christianity by his mother, Helena. At the Battle of Milvian Bridge in 312, after which Constantine would claim the emperorship in the West, Christian sources record that Constantine experienced a dramatic event. Before the battle, Constantine saw a cross of light above it (in one source, he saw the Christian symbol Chi-Ro), and with it the Greek words ΕΝ ΤΟΥΤΩ ΝΙΚΑ, meaning "by this, conquer!" Constantine commanded his troops to adorn their shields with the Christian symbol and were thereafter victorious.
How much Christianity Constantine adopted at this point is difficult to discern. The Roman coins minted up to eight years subsequent to the battle still bore the images of Roman gods. Nonetheless, the accession of Constantine was a turning point for the Christian Church. After his victory, Constantine supported the Church financially, built various basilicas, granted privileges (e.g., exemption from certain taxes) to clergy, promoted Christians to some high ranking offices, and returned property confiscated during the Great Persecution of Diocletian. Between 324 and 330, Constantine built, virtually from scratch, a new imperial capital that came to be named for him: Constantinople. It had overtly Christian architecture, contained churches within the city walls, and had no pagan temples. In accordance with a prevailing custom, Constantine was baptised on his deathbed.
Constantine also played an active role in the leadership of the Church. In 316, he acted as a judge in a North African dispute concerning the Donatist controversy. More significantly, in 325 he summoned the Council of Nicaea, the first Ecumenical Council, to deal mostly with the Arian controversy, but which also issued the Nicene Creed, which among other things professed a belief in "One Holy Catholic Apostolic Church." Constantine thus established a precedent for the emperor as responsible to God for the spiritual health of their subjects, and thus with a duty to maintain orthodoxy. The emperor was enforce doctrine, root out heresy, and uphold ecclesiastical unity.
Constantine's son's successor, known as Julian the Apostate, was a philosopher who upon becoming emperor renounced Christianity and embraced a Neo-platonic and mystical form of paganism shocking the Christian establishment. He began reopening pagan temples, and intent on re-establishing the prestige of the old pagan beliefs, he modified them to resemble Christian traditions such as the episcopal structure and public charity (previously unknown in Roman paganism). Julian's short reign ended when he died while campaigning in the East.
Christianity came to dominance during the reign of Julian's successors, and in 380 Theodosius I issued the edict De Fide Catolica establishing Christianity as the exclusive official state religion, outlawed other faiths, and closed pagan temples.
Dioceses and the Pentarchy
After legalisation, the Church adopted the same organisational boundaries as the Empire: geographical provinces, called dioceses, corresponding to imperial governmental territorial division. The bishops, who were located in major urban centres as per pre-legalisation tradition, thus oversaw each diocese. The bishop's location was his "seat", or "see."
Among the sees, five held special eminence: Rome, Constantinople, Jerusalem, Antioch, and Alexandria. The prestige of most of these sees depended in part on their apostolic founders, from whom the bishops were therefore the spiritual successors. Though the patriarch of Rome was still held to be the first among equals, Constantinople was second in precedence as the new capital of the empire.
Christianity, pope and paganisme.