So in your opinion, the criteria for being a spiritual Israelite is to have the faith of Abraham and be from the Jewish bloodline.
It's like your totally ignoring verse 7 and 8. Those two verses explain verse 6. Spiritual Israel is the children of the promise... which includes me.
Rom 9:7 Neither, because they are the seed of Abraham, are they all children: but, In Isaac shall thy seed be called.
Rom 9:8 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.
Galatians says that I am a child of the promise... I am like Isaac.
Gal_4:28 Now we, brethren, as Isaac was, are the children of promise.