Arianism is the theological teaching attributed to Arius, a Christian presbyter from Alexandria, Egypt, concerning the relationship of the entities of the Trinity ('God the Father', 'God the Son' and 'God the Holy Spirit') and the precise nature of the Son of God. The Arian concept of Christ is that the Son of God did not always exist, but was created by, and is therefore distinct from and inferior to, God the Father.
Arianism was a heresy of a Christian Faith first proposed early in the 4th century by the Alexandrian presbyter Arius. It affirmed that Christ is not truly divine but a created being. Arius' basic premise was the uniqueness of God, who is alone self-existent and immutable; the Son, who is not self-existent, cannot be God. Because the Godhead is unique, it cannot be shared or communicated, so the Son cannot be God. Because the Godhead is immutable, the Son, who is mutable, being represented in the Gospels as subject to growth and change, cannot be God. The Son must, therefore, be deemed a creature who has been called into existence out of nothing and has had a beginning
Arianism is defined as those teachings attributed to Arius which are in opposition to mainstream Trinitarian Christological dogma, as determined by the first two Ecumenical Councils and currently maintained by the Roman Catholic Church, the Eastern Orthodox Churches and most Protestant Churches. "Arianism" is also often used to refer to other nontrinitarian theological systems of the 4th century, which regarded Jesus Christ—the Son of God, the Logos—as either a created being, or as neither uncreated nor created in the sense other beings are created (as in Semi-Arianism).
Origins
Arius taught that God the Father and the Son did not exist together eternally. He taught that the pre-incarnate Jesus was a divine being created by (and therefore inferior to) God the Father at some point, before which the Son did not exist. In English-language works, it is sometimes said that