Q. 1. Can you summarize what was the heresy of ARIANISM?
A. 1. The heresy of Arianism is a denial of the true divinity of Jesus Christ in a variety of specific forms, of which all agreed that Jesus Christ was created by the Father, that He had a beginning in time, and that the title "Son of God" was one of courtesy.
This doctrine originated with Arius (250 AD to 336 AD), a Christian presbyter who lived and taught in Alexandria, Egypt.
The Arian concept of Christ is that the Son of God did not always exist, but He was created by and is therefore distinct from God the Father. This belief is grounded in the Gospel of John [14:28] where it states: "You heard me say, 'I am going away and I am coming back to you.' If you loved me, you would be glad that I am going to the Father, for the Father is greater than I."
Arius was first pronounced a heretic at the First Council of Nicea in 325 AD. Later, in 335 AD, at the regional First Synod of Tyre, he was exonerated as a result of imperial pressure. He was finally declared a heretic after his death. The heresy was finally resolved in 381 by the First Council of Constantinople.