Romans 9

It is apparent as Paul writes to the Romans that the Jewish converts still have this core believe that they are saved just be being descendents of Abraham. John the Baptist had already diputed this whole premise as he taught -

"...that God is able of these stones to raise up children unto Abraham." (New Testament | Matthew 3:9)

John made it clear that there were salvation had its conditions for -

"...the axe is laid unto the root of the trees: therefore every tree which bringeth not forth good fruit is hewn down, and cast into the fire." (New Testament | Matthew 3:10)

Paul now teaches much the same to the Roman Jewish converts -

"...For they are not all Israel, which are of Israel:
7 Neither, because they are the seed of Abraham, are they all children..." (New Testament | Romans 9:6 - 7)

"That is, They which are the children of the flesh, these are not the children of God: but the children of the promise are counted for the seed." (New Testament | Romans 9:8)

Israel is only Isreal, or the faithful will become Israel if they demonstrate faith through righteouness or as Paul taught -

"What shall we say then? That the Gentiles, which followed not after righteousness, have attained to righteousness, even the righteousness which is of faith." (New Testament | Romans 9:30)