Which leads to the question: what is it about the faith expressed at Nicea that would cause Constantine, a recent convert, to "stack the deck" in favor of that position over that of Arius? Some could argue that it was a whim considering that Constantine seemed to vacillate somewhat later on.
Because 300+ bishops showed up at Nicea AGAINST Arius, and only a handful showed up to support him.
He was after UNITY. So he picked the side with the most supporters.
"At Nicea, there were few delegates from the West (Alexandria, where the Arian teaching was generally accepted and caused no controversy). From the East, on the other hand, the delegates arrived in force: probably 300 or more, many of them with impressive records of persecution for the faith".....
"The doctrinal point of issue interested Constantine not at all: his military cast of mind had little patience with theological niceties. He was, however, determined to put an end to this controversy."
"For Constantine, The first Ecumenical Council was a triumph..... He has established both a great confederacy of Eastern and Western Churches and his own moral supremacy over it."
So who knows? But look at it this way -- maybe the 300+ bishops showed up from the East because God moved them to. It is very hard to PROVE anything based upon the history of the Church. It is not black and white like people would like you to believe.
Why do I say this? -- because futher on in history (Page 15) the Emperor is impressed with Arius because his family supports him and tries to have the Patriarch allow him to return. When he refuses -- the Emperor decides that the Patriarch is now the impediment to Church unity -- "Thus the Emperor gradually conceded that Athanasius, rather than Arius, was now the chief impediment". Constantine then had all these charges trumped up against Athanasius, fearing for his life, Athanasius fled and was deposed.
It finally took the people rioting when Arius was brought back that forced the Emperor to back down.