Oh I agree 100%, sorry if I gave other impression. Some metaphor can also be more parabolic (i.e. more like a parable to relate to those who understand a certain language) - true?
You see, I believe that the Trinity doctrine is a result of terminology used in Scripture itself using "father gods" and "son gods" (e.g. Saturn-Jupiter) terminology (in some places) to relate the reality of the one true God becoming man to pagans who had pervasive concepts of "father gods" and "son gods". They even believed that some of their gods impregnated human women and had children of "gods". In the Roman Empire, some emperors were "gods" and had the title "son of god" (Divi Filius)."father-son" "god-man".
So, I propose that much of the Gospel of John (a later Gospel) is a parabolic metaphor for Greek/Roman pagan religious (of Roman Empire) to help them relate to the one true God. In the Christian Creeds we see repeated emphasis: "one God", "true God", "you alone are the Most High"... They are dealing with pagans who believed in many "gods" and "sons of gods". Even the Creeds had to keep stressing this into their heads. Jewish people did not need this, they already believe in one God. Is it any wonder Jews were not interested in what was once a Jewish movement (Christianity)?
Sorry Coder, but Christianity - if not for others, to me yes - was never a Jewish movement. It was born already Christian when Paul preached for a whole year in the synagogue of the Nazarenes in Antioch and, at the end of a whole year, the disciples started being called Christians. (Acts 11:26)