This argument however is specifically off topic. The whole point of this thread was to see if nonTrinitarians could defend their position without resorting to criticizing the Roman Catholic Church, of which I am not a member. Thus far, the answer to that seems to apparently be "no," since neither you nor
@Imagican have been able to avoid going down that road.
In fact, I would propose that the main thrust of the arguments presented seems to be "The Nicene Creed says Catholic, therefore it must mean the Roman Catholic Church, and therefore everything it says must be wrong." I myself am deeply suspicious of those who base their entire theological position around attacking another denomination.
At any rate, this is a non-issue, because you are simply misinterpreting the creed. One fact you ignore is that Nicea fell under the jurisdiction of the Church of Constantinople, which in the course of schisms separated from Rome and is Orthodox, and both Arius and his main prosecutors Ss. Alexander of Alexandria and Athanasius, were from the Chuch of Alexandria, which today exists in the form of separate Coptic and Greek Orthodox jurisdictons, having also never been a part of the Roman Catholic Church, and having not been in communion with Rome since 451 and 1054 respectively. The Roman Pope (who was not called "Pope" in those days) did not even personally attend Nicea due to the distance involved, but rather sent legates, and acceded to the council after the fact.