Neither, because they are the seed of Abraham, are they all children: but, In Isaac shall thy seed be called. 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." -- Romans 9:6-8"Not as though the word of God hath taken none effect. For they are not all Israel, which are of Israel:
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." -- Romans 9:6-8
And so how do we KNOW who is the "children of the promise"? Because someone makes that claim for themselves? Or is it expressed in one's faith working through love? Read the last sentence of Romans 2. That is my take on the matter. The point is many will say "Lord, Lord", but few are really His "children".
Regards