Absolutely, Paul taught against bigotry by proclaiming that Christ is the basis of salvatioin for the whole world, regardless of nationality or ethnicity. He died for the whole world, and not just for Israel!
Again, this does not mean nationality and ethnicity does not figure into God's promises and plans! To say that salvation operates for everybody, without discrimination, is not the same thing as saying God may only save the Greeks, and possibly leave out the rest of the nations and peoples!
On the contrary, God specifically requires that salvation take place in *every* nation and people! Do you see the difference? In one case, God promises that every nation and ethnicity will be touched by Salvation. This is a *necessary* national and ethnic requirement, that every nationality and ethnicity be touched with salvation!
But saying that the salvation of every nation and people is based exclusively on Christ alone is another matter entirely. It does not allow God to reach only one nation, since He Himself has promised salvation to *all* of them!