Very interesting discussion. Atheist Bible Study Group! Is this another mysterious way of God's Action and a proof for the existence of God?
I understand your view and I agree.
Since Paul was more influential than any other people in the NT, I think it may be interesting to understand his vision. I am no expert in this and confess it's been a while since I read the NT. But, my impression was that the idea of salvation by FAITH in the God Jesus alone is distant from Judaic view. Also his role in Gentile Christians required the split from Jews, IMO. I do not remember his mentioning of the image of the almighty warrior God described in early OTs written before the Babylonian Captivity. I think this kind of Judaic God's image might have been more problematic to the Mediterraneans, especially when the God's temple was destroyed by the Romans. The messiah in the OT turned out to be another failure as well. The Judaic Messiah did not restore the Jerusalem even though he was killed by Jews. Even though the early Christians hoped for the second coming of Messiah, like today's Christians, it could have been interpreted as a failure for many including gentiles if they heard about Jewish versions of the Messiah. For this, he might have adopted salvation by FAITH in JESUS instead of restoration of Jehovah's Kingdom(?) and resurrection after death, different image of Messiah that is not depicted in the OT. Totally individual level redemption.
God of the OT might have been kept for authorization by the Apostles and other Judaic Christian authorities for political reasons. This kind of attempt might have failed as discussed before. But again, if his targets were gentiles did he need the OT's God other than political reasons? Why did he need the failed God? Another god, son of god, descendant of lesser god with better power, isn't it the image of zeus on Mt Olympus?