So, Abraham was saved but never had a birth of the Spirit of God? Srsly?
In Abraham's day, the ministry of the Spirit was the same as it was in the Day that Christ taught this:
John 14:15-18
King James Version (KJV)
15 If ye love me, keep my commandments.
16 And I will pray the Father, and he shall give you another Comforter, that he may abide with you for ever;
17 Even the Spirit of truth; whom the world cannot receive, because it seeth him not, neither knoweth him: but ye know him; for he dwelleth with you, and shall be in you.
18 I will not leave you comfortless: I will come to you.
It was an external ministry unlike the one which would begin when the Spirit is sent. The living waters here...
John 7:38-39
King James Version (KJV)
38 He that believeth on me, as the scripture hath said, out of his belly shall flow rivers of living water.
39 (But this spake he of the Spirit, which they that believe on him should receive: for the Holy Ghost was not yet given; because that Jesus was not yet glorified.)
...is the same eternal life taught He had come when He spoke of it in terms of the True Bread (Himself) as opposed to the physical provision of the Old Teastmant (physical bread for physical sustenance, manna) in John 6.
We see above the Spirit is not yet given, and correlating to Christ's teaching above that cannot be imposed prior to Christ being glorified.
This is the same Promise in view here:
Acts 1:4-5
King James Version (KJV)
4 And, being assembled together with them, commanded them that they should not depart from Jerusalem, but wait for the promise of the Father, which, saith he, ye have heard of me.
5 For John truly baptized with water; but ye shall be baptized with the Holy Ghost not many days hence.
One cannot be born again apart from having the Spirit sent, Who is the source of Eternal Life. But, that does not mean one cannot be saved from the Eternal Perspective of God, even though he does not live in the Age where a particular dispensation begins.
We see the point in time in which men are born from above (also called born of the Spirit, and born again, and regeneration) here:
John 1:11-13
King James Version (KJV)
11 He came unto his own, and his own received him not.
12 But as many as received him, to them gave he power to become the sons of God, even to them that believe on his name:
13 Which were born, not of blood, nor of the will of the flesh, nor of the will of man, but of God.
It cannot be imposed prior to the Coming of Christ. He didn't do that, and there is no reason we should either.
So yes, Abraham could be said to be "saved" in the sense that he was justified, just as all the Old Testament Saints listed in Hebrews 11 were. However, what they were not were recipients of the realization of the Promises of God:
Hebrews 11:13
King James Version (KJV)
13 These all died in faith, not having received the promises, but having seen them afar off, and were persuaded of them, and embraced them, and confessed that they were strangers and pilgrims on the earth.
Hebrews 11:39-40
King James Version (KJV)
39 And these all, having obtained a good report through faith, received not the promise:
40 God having provided some better thing for us, that they without us should not be made perfect.
They received the promises, but they did not receive the Promises, lol.
They were not made perfect, but, when, in this Age, we are saved, we receive of the Spirit that was only promised to them. The external ministry of the Spirit still continues, but that is to be distinguished from the Eternal Indwelling of God in believers in this Age.
God bless.