What had once been a simple faith which could be understood by the man in the street, became a complex system of theology which was the preserve of an educated elite. The Christian church became an establishment with political influence and political power. It also became divided.
You also can find more about the historical developments how the Trinity came in to Christianity at the Belgian Biblestudents in the continuation from the articles: The First Century of Christianity & Positioning of those in power, in Power and position and to be published later Early days of Christianity: Minimizing the power of God’s Force the Holy Spirit; Second Century; Hellenistic influences; Politics and power first priority; Blending of Jewish, Oriental, and Hellenic thought; a.o.
