What promises are you talking about?
Our discussion was centered around salvation. The Scriptures are very clear about Abraham's salvation:
For what saith the scripture? Abraham believed God, and it was counted unto him for righteousness. (Romans 4:3)
The promises made to Abraham and his one seed Christ pertain to salvation. Had Abraham received the promises when the book of Hebrews was written? Has Abraham received the promises even today?
And I will put enmity between thee and the woman, and between thy seed and her seed; it shall bruise thy head, and thou shalt bruise his heel.
What do you think that pertains to? Maybe this? that through death he might destroy him that had the power of death, that is, the devil;
Heb 5:9 And being made perfect, he became the author of eternal salvation unto all them that obey him;
The first cause of. How? who is the beginning, the firstborn from the dead;
The seed of Abraham the only begotten Son of God by a woman. Now to Abraham and his seed were the promises made. He saith not, And to seeds, as of many; but as of one, And to thy seed, which is Christ. For if the inheritance [be] of the law, [it is] no more of promise: but God gave [it] to Abraham by promise. Wherefore then [serveth] the law? It was added because of transgressions, till the seed should come to whom the promise was made;
Rom 4:13 For the promise, that he should be the heir of the world, [was] not to Abraham, or to his seed, through the law, but through the righteousness of faith. That is the faith shown below.
Gal 3:23 And before the coming of the faith, under law we were being kept, shut up to the faith about to be revealed,
Gal 3:25 and the faith having come, no more under a child-conductor are we,