Historical development
Because Christianity converts cultures from within, the doctrinal formulas as they have developed bear the marks of the ages through which the church has passed. The rhetorical tools of secular philosophy, especially of Neoplatonism, are evident in the language adopted to explain the church's rejection of Arianism, Sabellianism, Adoptionism, etc. Augustine of Hippo has been noted at the forefront of these formulations; and he contributed much to the speculative development of the doctrine of the Trinity as it is known today, in the West; the Cappadocian Fathers (John Chrysostom, Basil the Great, and Gregory Nazianzus) are more prominent in the East. The imprint of Augustinianism is found, for example, in the western Athanasian Creed, which, although it bears the name and reproduces the views of the fourth century opponent of Arianism, was probably written much later.
These controversies were for most purposes settled at the Ecumenical councils, whose creeds affirm the doctrine of the Trinity. Constantine the Great who called the first of these councils, in AD 325, arguably had political motives for settling the issue rather than religious reasons; as he personally favored the Arian party, which in politically key regions of the Empire held a majority over the Catholics. It was also the form of Christianity that had been adopted by northern tribes of Vandals, and it would have given Constantine an advantage in defense against them, if the council adopted the same faith. It was not to be. The arguments of the deacon Athanasius prevailed; and over the next three hundred years, the Arians were gradually converted to Catholicism.
According to the Athanasian Creed, each of these three divine Persons are said to be eternal, each said to be almighty, none greater or less than another, each said to be God, and yet together being but one God. According to the teachings of orthodox Christianity, the three persons of the Holy Trinity are said to share one Divine Nature, thus preserving their belief in one God. So are we forbidden by the catholic religion to say; There are three Gods or three Lords. -- Athanasian Creed, line 20
Some opponents of this view contend that these three "Persons" are not separate and distinct individuals. The modalists attempted to resolve the mystery of the Trinity by holding that, while God is numerically one, the Father, the Son and the Holy Ghost are merely modes, roles, or manifestations of God Almighty. These titles describe how humanity has interacted with or had experiences with God. In the Role of The Father, God is the provider and creator of all. In the mode of The Son, man experiences God in the flesh, as a human, fully man and fully God. God manifests Himself as the Holy Spirit by his actions on Earth and within the lives of Christians. This view is known as Sabellianism, and was rejected as heresy by the Ecumenical Councils although it is still prevelant today among denominationss known as "Oneness" Christians. Trinitarianism insists that the Father, Son and Spirit simultaneously exist, each fully the same God.
Some feminist theologians refer to the persons of the Holy Trinity with more gender-neutral language, such as Creator, Redeemer, and Sustainer (or Sanctifier). This is a very recent formulation, and emphasizes their roles rather than their personhood. Since, however, each of the three divine persons participates in the acts of creation, redemption, and sustaining, traditional Christians reject this formulation as simply a new variety of Modalism.
The doctrine developed into its present form, precisely through this kind of confrontation with alternatives; and the process of refinement continues in the same way. Even now, ecumenical dialogue between Eastern Orthodox, Oriental Orthodox, Roman Catholic, and trinitarian Protestants, seeks an expression of trinitarian doctrine which will overcome the extremely subtle differences that divide them into separate communions. The doctrine of the Trinity is symbolic, somewhat paradoxically, of both division and unity.
Dissent from the doctrine
Many Christians believe that the orthodox doctrine of the Trinity is so central to the Christian faith, that to deny it is to reject the Christian faith entirely. However there have been a number of groups both historical and current which identify themselves as Christians but yet have an alternative view of the trinity. One ancient sect, called Ebionism, said that Jesus was not a "Son of God," but rather an ordinary man who was a prophet -- a view of Jesus shared by Islam. Other groups have an understanding of the Trinity that differs from orthodox formulation shared by Catholics, Protestants, and Eastern Orthodox. These include the Church of Jesus Christ of Latter-day Saints, the Jehovah's Witnesses (who reject the Trinity doctrine entirely), Christian Science, the Unification Church, Unitarian Universalists and Oneness Pentecostals (Who believe that there is one God with no essential divisions in His nature. He is not a plurality of persons, but He does have a plurality of manifestations, roles, titles, attributes, or relationships to man. Furthermore, these are not limited to three).
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