While this verse does say that He came to save His people from their sins, it doesn't say that He didn't come to save Samaritans or Gentiles. If I say that I have come to speak about apologetics, but also speak about sports, it is still correct if I say I come to speak on apologetics. I never said I wouldn't speak about sports, though. In a similar way, the verse above doesn't say that Jesus will avoid saving non-Jews.
That's the dilemma. What was accomplished in the death of Christ?
As to your first statement, a new question; If Jesus came to save his people, the Jews, why aren't they all saved?
As to your ending statement, I think one can be Gods and not be Jewish. Jesus still came to save His people, including Greek and gentile.
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There is a progression in the gospels because this was His intention.
I'm not sure what you mean by "his intention". What were the intentons of Christ?
I'm afraid you really didn't answer my question. The context of it was what the atonement accomplished.......universal atonement or particular atonement? Those two verses seem to support both views, which would be contradictory. Could you help us to understand the very nature of Christ's atonement?