“The accession of Constantine terminated the pacifist period in church history.” Roland Bainton
If peace of the pacifist kind, as defined by Jesus and as taught by the church for its first 300 years, is central to the gospel, in what sense can it be said that Christianity survived the Constantinian shift? Roland Bainton traces small remnants of pacifism throughout church history, but the overwhelming sense is that the flame of the true teaching of Christ flickered only slightly, if at all, for long periods of church history. Since we are located on the other side of this shift in a period as Constantinian as any other, it may be difficult to recognize the contrast between Christianity before Constantine and the Christendom that came after. But as many are turning from the church in protest at the ugliness of the Christian religion it may be the opportune time to point out that the religion and teaching of Christ have been all but erased by the Constantinian form of the faith. Here in summary fashion is a delineation of the difference Constantinianism wrought upon the Christian faith. (While the shift brought about by the man Constantine is partly in view, the shift begins prior to his conversion and some one hundred years after his death.)
1. A different authority: Church councils came to bear a new authority which continues in both East and West. Constantine called himself the bishop of bishops and he applied his pagan assumptions about the place of priests in the empire. Not yet baptized, Constantine determined the phrasing and was the decisive voice at the Council of Nicaea in determining questions surrounding the Trinity. As John Howard Yoder points out, his primary concern in determining doctrinal issues, as with later emperors, was what was best for the empire. The presumption was that the church must speak with a unified voice on doctrinal questions and the council presumed to be that voice. The rise of the centralized leadership vested in the pope can be attributed to the unfolding of the same Constantinian logic in which there is a singular head and voice for each realm of power and this singularity is presumed to be unifying.
2. A different ethic: Where Christians refused military service prior to Constantine, subsequent to Constantine Christians were not only favored but it was required (by 436) that soldiers be Christians. There was not only an abandonment of nonviolence but there was no longer the resource in the New Testament for ethics, as this was a new situation, so there was a turn, by Ambrose and Augustine, to the Roman heritage, especially Cicero, to work out a new form of the Christian ethic for those serving Rome.
3. A different worldview: Augustine’s Neo-Platonism and the rise of Constantine would cement the duality that presumed God was using the emperor to do some things and Christians to do other things. There is the peace of Rome, the Pax Romana, and the peace of Christians, which were thought to complement one another. It is from this period that a notion like that of Robert Jeffress arises, that Jesus in not fit to be Caesar or president. Should the ruler be Christian he must employ something other than the ethic of Jesus to rule, as the world is split and Jesus’ ethics pertains to the private portion of that world. The soul/body split necessary for a violent Christianity became the norm.
4. A different definition of Church: Under Theodosius, who became emperor in 379, an edict defined the one true Catholicism as Trinitarian believers in communion with the bishops of Rome and Alexandria. The Council of Constantinople confirmed that those who were less willing to forgive the apostate (the Donatists) or those with an alternative view of Christ (the Arians) did not have the support of the state and therefore were not part of the church. Augustine believed that the state had to force the heretics (he quotes Jesus, “Compel them to come in”), the Donatists, to comply to the edict and eventually their property was confiscated and their meetings banned. State support determines the boundaries of the church through state power.
This clear delineation of who was counted out was aggravated by the fact, that unless you were a Donatist or Arian or a barbarian, everybody was Christian (except a few Jews) no matter the level of objective commitment to Christianity. So, Augustine declared the true church was now invisible as the visible spectacle offered no hint of a subjective commitment. This leads to the notion that most people counted as Christians were not considered saved. The church is to be found primarily among the priests, authorized by other priests, so that the sequence of ordination coming down from Jesus through the bishops and through those authorized to perform the sacraments, most clearly demonstrated the presence of God. Even priests and bishops though, may not be elect as they can be hypocrites and so the invisibility of the church is nearly complete. This means that the visible form of Christianity can be described in non-New Testament ways, as Neoplatonic dualism divides the visible and invisible realms nearly completely.
5. A different definition of state: Rome became a “Christian state” as it transitioned from the persecution of Christians to the imperial requirement of one Christian norm for all citizens. People were still free to be non-Christians but they would suffer disadvantages and they had no alternative public worship. This would have subsidiary effects on most every aspect of Christian doctrine, as being baptized and remaining in communion involved both church and state.
6. A different understanding of church/society relations: The story is told that Pope Sylvester and Emperor Constantine agreed to split between them the realm of the empire and the realm of the church so as to work in support of one another. The practical result was that church government fell into the hands of civil government, and the one who bore the sword would determine who became a bishop.
7. A different meaning of baptism: Because of the new relationship of church and state becoming a Christian and becoming a citizen were fused, so that infant baptism (historians cannot agree upon its origins) became universal – no citizen should be left unbaptized. Neither citizenship nor church membership were voluntary.
8. A different set of rituals: To accommodate the 90 percent of the population who had not been Christian prior to Constantine pagan rituals, such as spring fertility celebrations, could be celebrated under the auspices of Passion and Easter. Christmas is usually considered to be the best example, though its origins are more obscure, of an incorporation of a pagan celebration into the church. The cult of the dead, seemingly the universal religion presuming the dead hear and answer prayer, was given a Christian flavor. These new celebrations arose with Constantine as an attempt to take in what was already being observed and celebrated.
9. A different theology: The church would undertake a reinterpretation of troublesome parts of the Bible inveighing against violence (the sermon on the Mount is for the individual acting in private) and would focus on obscure passages to illicit the possibility for violence (the cleansing of the temple, Jesus command to get a sword, etc.) and there was a relinquishing of notions of the possibility of perfection (not possible as government would always be necessary to constrain sin), and sin is inescapable and Original and thus infects all upon conception, and gradually a new meaning would be given to the death of Christ (divine satisfaction rather than Christus Victor – the implications of which were less than flattering for the emperor – Satan’s earthly representative). Augustine’s notion of the church invisible came with a new doctrine of election, he presumed about 5% of the population of Rome might be elect and saved. No one could be sure who might be included in that 5%, as God’s election is secret (we are not far from Calvin’s double predestination).
10. A different idea of history: Prior to Constantine the singular fact for Christians was their life and experience of the body of Christ, while after Constantine they would have to take it on faith that there is a church (as it is invisible). Before Constantine it was presumed that God is at work in history but it was not clear how, while after Constantine it was a fact that God governs history through Rome and the emperor. As Yoder concludes, the eschatology of the New Testament had been turned upside down.
Protestantism is not going to escape the Constantinian shift, but if anything, aggravates it in its dependence upon particular princes and city states to preserve the new form of the faith. As a result, notions of just war, the role of church and state, especially with Luther’s notion that God is doing one thing with the hand of state and another with the hand of the church (clarifying Augustine’s two cities), will accentuate the problem of violence. Augustine’s Constantinian faith created a dualism that continues in Protestant notions that perfection is for another world and what counts now is the inner faith. While there is a reaction against the authority of the pope and a turn to the authority of the Bible, the Bible will be made to serve, in an unbalanced manner, as the corrective to the authority invested in pope and emperor. At the same time, the continuation of just war theory indicates that the New Testament is still relegated to a limited role: Jesus did not command or permit the sort of moral understanding entailed in the theory. Common sense, natural theology, human reason, in spite of Luther’s protests against the theologians of glory, will continue as a parallel authority.
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 Throughout I am following John Howard Yoder, Christian Attitudes to War, Peace, and Revolution (pp. 57-65). Baker Publishing Group. Kindle Edition.