Nonsense.
Let me show you how lame that last statement is.
Early Trinitarian Quotes | Doctrine of the Trinity Quotes | Christian Apologetics and Research Ministry
If, as the anti-Trinitarians maintain, the Trinity is not a biblical doctrine and was never taught until the council of Nicea in 325, then why do these quotes exist? The answer is simple: the Trinity is a biblical doctrine and it was taught before the council of Nicea in 325 A.D.
Part of the reason that the Trinity doctrine was not "officially" taught until the time of the Council of Nicea is because Christianity was illegal until shortly before the council. It wasn't really possible for official Christian groups to meet and discuss doctrine. For the most part, they were fearful of making public pronouncements concerning their faith.
Additionally, if a group had attacked the person of Adam, the early church would have responded with an official doctrine of who Adam was. As it was, the person of Christ was attacked. When the Church defended the deity of Christ, the doctrine of the Trinity was further defined.
So, contrary to joachin's claims, the essence of the Trinity was taught long before the 3rd century.