I see what your getting at and I want to research.Just to be safe saying "more than one gospel" might be technically accurate but it may get your message attacked without being read.
I read it all and it answers many of those nagging questions that denominations squabble over.
Let's see if I grasp what your saying:
Fred=Are we saved by works or by faith.
Barney=Is your mother Jewish?
Barney=Faith in the Lord Jesus Christ
Fred=What if I was Jewish
Barney=Well that's another story
So would the conversation go something like that?
Anyway you convinced me it's worth looking into.
PS.I just found another verse that may show the difference:
Matthew 25:32 And before him shall be gathered all nations: and he shall separate them one from another, as a shepherd divideth his sheep from the goats:
English=races,peoples or Gentiles(excluding Israel)
Well this is getting interesting and I have developed some new questions already.