It absolutely was physical according to the flesh. What Romans 9 is pointing out is the specific seed line of Christ.
3 For I could wish that myself were accursed from Christ for my brethren, my kinsmen according to the flesh:
4 Who are Israelites; to whom pertaineth the adoption, and the glory, and the covenants, and the giving of the law, and the service of God, and the promises;
5 Whose are the fathers, and of whom as concerning the flesh Christ came, who is over all, God blessed for ever. Amen.
6 Not as though the word of God hath taken none effect. For they are not all Israel, which are of Israel:
7 Neither, because they are the seed of Abraham, are they all children: but, In Isaac shall thy seed be called.
Though Ishmael came from Abraham, he was not counted as a son, but Isaac was the son of promise. The Fathers of the nation of Israel are Abraham, Isaac, and Jacob. That's the line of a true Jew.
3 For I could wish that myself were accursed from Christ for my brethren, my kinsmen according to the flesh:
4 Who are Israelites; to whom pertaineth the adoption, and the glory, and the covenants, and the giving of the law, and the service of God, and the promises;
5 Whose are the fathers, and of whom as concerning the flesh Christ came, who is over all, God blessed for ever. Amen.
6 Not as though the word of God hath taken none effect. For they are not all Israel, which are of Israel:
7 Neither, because they are the seed of Abraham, are they all children: but, In Isaac shall thy seed be called.
Though Ishmael came from Abraham, he was not counted as a son, but Isaac was the son of promise. The Fathers of the nation of Israel are Abraham, Isaac, and Jacob. That's the line of a true Jew.