The church has its flaws. Doctrinal controversies are not always resolved in a Christlike way. The Nicene Creed is testimony to that. And yet truth wins in the end. Scripture supports the teaching of the Nicene Creed.
Persona is a Latin word that originally referred to the masks worn by actors on a stage.
Theologians adopted the term to indicate three ways of being, not to imply three separate beings. In the creed, it is not a reference to the Roman church, which later claimed to be universal. The Roman Catholic Church called the Nicene Council to enforce trinitarian teaching. Constantine forced the council to accept a pagan doctrine. Constantine forced all Christians to accept the Nicene Creed.