@Dave M @B-A-C
Regarding Israel going into the land, it doesn't fulfill the promise to Abraham. In Galatians 3 Paul argues that very point.
Even as Abraham believed God, and it was accounted to him for righteousness. 7 Know ye therefore that they which are of faith, the same are the children of Abraham. 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. 9 So then they which be of faith are blessed with faithful Abraham. 10 For as many as are of the works of the law are under the curse: for it is written, Cursed is every one that continueth not in all things which are written in the book of the law to do them. 11 But that no man is justified by the law in the sight of God, it is evident: for, The just shall live by faith. 12 And the law is not of faith: but, The man that doeth them shall live in them. 13 Christ hath redeemed us from the curse of the law, being made a curse for us: for it is written, Cursed is every one that hangeth on a tree: 14 That the blessing of Abraham might come on the Gentiles through Jesus Christ; that we might receive the promise of the Spirit through faith. 15 Brethren, I speak after the manner of men; Though it be but a man’s covenant, yet if it be confirmed, no man disannulleth, or addeth thereto. 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. 17 And this I say, that the covenant, that was confirmed before of God in Christ, the law, which was four hundred and thirty years after, cannot disannul, that it should omake the promise of none effect. 18 For if the inheritance be of the law, it is no more of promise: but God gave it to Abraham by promise.
The Holy Bible: King James Version, Electronic Edition of the 1900 Authorized Version. (Bellingham, WA: Logos Research Systems, Inc., 2009), Ga 3:6–18.
Notice, verse 17, he says the Law which was 430 years later, cannot disannul or add to promise. Then he says if the inheritance came by the Law then it is no longer of promise, but God gave it to Abraham by promise. So, he argues that Israel entering the land under the Mosaic Law cannot overturn the promise God made to Abraham.
We also know that Israel going into the land didn't fulfill the promise to Abraham from Stephens words in Acts 7
Then said the high priest, Are these things so? 2 And he said,
Men, brethren, and fathers, hearken; The God of glory appeared unto our father Abraham, when he was in Mesopotamia, before he dwelt in Charran, 3 And said unto him, Get thee out of thy country, and from thy kindred, and
come into the land which I shall shew thee. 4 Then came he out of the land of the Chaldaeans, and dwelt in Charran: and from thence, when his father was dead, he removed him into this land, wherein ye now dwell. 5 And
he gave him none inheritance in it, no, not so much as to set his foot on:
yet he promised that he would give it to him for a possession, and to his seed after him, when as yet he had no child.
The Holy Bible: King James Version, Electronic Edition of the 1900 Authorized Version. (Bellingham, WA: Logos Research Systems, Inc., 2009), Ac 7:1–5.
Stephen says that God promised the land to Abraham and his seed, yet he got none of it. He didn't even get enough to set his foot on. So, this promise has not been fulfilled. The only way God can fulfill this promise is to resurrect Abraham and give him this land as his inheritance. And, as Paul said, if you are Christ's, then you are Abraham's seed and heirs according to the promise. The land is the inheritance and Christians will take part in it because they are joint heirs with Christ and are Abraham's seed.