Ros,
As you know, the Trinitarians knock JWs for being "polytheists," worshippers of more than one god. But that is not quite accurate, for as we know, JWs do not worship their little g god, Jesus. I think I understand to you say that Jesus was a little g god before Pentecost and afterwards he became a big G God. Does that mean from that point on Christians should no longer call Christ's father their God, or do we now have worship two Gods and leave ourselves open to the charge of being polytheists? You mention that it is helpful to "think Jewish." Obviously Jews would not think much of us having two Gods.
You wrote: it was once pointed out to me that if the Biblical scribes Jewish leaders had not become superstituous about God's OT name, leaving it out of the Greek translations, the whole confusion that has led to the trinity doctrine might never have occurred.
As you know, historians tell us that the personal name of God, as recorded in the Old Testament, was not used in either its written or spoken form for many years before the time of Christ. Because the Jews were afraid that casual use of the divine name might amount to "taking the name of the Lord in vain," they actually forbid its use altogether.
As you also know, the Bible tells us that for Christians the name of Jesus should be promoted above every name. (Phil. 2:9) Has it occurred to you that it may have been by God's own design that His Old Testament name fell out of use and was eventually lost, to make certain that the name of Jesus Christ would be put "above all names" by Christians?
Just a thought.