Gal 3:8 And the scripture, foreseeing that God would justify the heathen through faith, preached before the gospel unto Abraham, saying, In thee shall all nations be blessed.
Who preached (foreseeing is a better translation in my view) the Gospel?
Scripture.
Who only has died and been resurrected not to see, again, death, that death no longer has dominion over him? Jesus of Nazareth. Therefore by God telling Abraham to kill his only son Isaac when he was only a youth the gospel was preached as explained in Hebrews 11:17-19 By faith Abraham, when he was tried, offered up Isaac: and he that had received the promises offered up his only begotten son, Of whom it was said, That in Isaac shall thy seed be called: Accounting that God was able to raise him up, even from the dead; from whence also he received him in a figure.
Correct. Because God promised to bless all families of the earth through him, he knew that this meant through his descendants. So he knew God would have to resurrect Isaac because God cannot lie, and does not renege on His promises.
Isaac has not been raised from the dead. Who was received? Gal 3:16? 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.
Praise God.
But, Abraham, and Israel, saw fulfillment in physical terms, which is not excluded from the Promises of GOd, but was not what was fulfilled when Christ came. Here is an example of the Disciples of Christ still having a physical expectation on the Day of Ascension:
Acts 1:4-7
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.
6 When they therefore were come together, they asked of him, saying, Lord, wilt thou at this time restore again the kingdom to Israel?
7 And he said unto them, It is not for you to know the times or the seasons, which the Father hath put in his own power.
Never ceases to amaze me, lol. They have just been told they are going to be Baptized with the Holy Ghost, and they're concerned about the physical Kingdom promised by God.
I agree that Abraham probably knew nothing of Christ and or Jesus but he understood that death and resurrection were necessary for the blessings of God to come to fruition.
Well, would have been necessary in the case of Isaac, had he been sacrificed.
But praise God, He provided Himself a Lamb...
The Gospel of Jesus Christ simply wasn't revealed in the Age of Law, or any Age prior to that. And seeing that God did bring them into their own land, and fulfilled some promises, it is not strange for them to think they had "arrived." Aren't we glad that isn't the case?
God bless.