I also see That God promised it to them forever. with NO specifications (you still have not shown me in Gen 12 15 and 17 where they are told they must behave or they would lose it)
Since this seems to be all you really have to stand on, and you keep repeating it, perhaps you can explain how you define forever? Because it is my belief that when God makes an unconditional promise that is forever it does NOT mean we have it one day, and it's gone the next. For that reason God said to Abraham "the land which thou seest, to thee will I give it, and to thy SEED for ever".
Genesis 12:7 (KJV) And the LORD appeared unto Abram, and said,
Unto thy seed will I give this land: and there builded he an altar unto the LORD, who appeared unto him.
Genesis 13:15 (KJV) For all the land which thou seest,
to thee will I give it, and to thy seed for ever.
Genesis 12:7 (KJV) And the LORD appeared unto Abram, and said,
Unto thy seed will I give this land: and there builded he an altar unto the LORD, who appeared unto him.
Here is the promise of God to Abraham and his SEED and all who come from the Seed that is Christ. The promise God made to Abraham's biological seeds was to give them the land of Cannan, and they could have remained on the land for ever only for as long as they remained faithful unto God. The same promise given to Adam and Eve. If they had obeyed God and not taken of the tree of knowledge of good and evil they could have lived in an undefiled earth forever. But they did NOT obey God and as a result of their disobedience the earth and every living thing upon it is destined to sin and death.
Here is how the Hebrew word for ever is defined. You can see for yourself that when God says for ever it means it can NEVER begin and then end, then begin again. It is for that reason that God blocked the way to the tree of life in the Garden of Eden, because if man ate of the tree of life in the middle of the garden after sin entered creation, man would have lived for ever in a world that from the fall belonged to Satan where evil would be their way of life that would never end. If man ate of the tree of life after the fall, their fate of living in a cruel and evil world defiled by sin would be never ending. In the same way the promise of God to Abraham and his SEED is never ending when all who are of faith inherit the whole new earth it will be our never-ending home. A far greater promise than the promise given to Abraham's biological seeds that could never be obedient to keep God's Law and Commandments. This too was that they would know of their need for a Savior/Redeemer and believe the law that pointed to Him and the prophets that foretell of His coming.
Strong's Hebrew Dictionary
5769. עוֹלָם owlam (ʻôwlâm)
Search for H5769 in KJVSL; in
KJV.
עוֹלָם ʻôwlâm, o-lawm'
or עֹלָם ʻôlâm; from
H5956; properly, concealed, i.e. the vanishing point; generally, time out of mind (past or future), i.e. (practically) eternity; frequentatively, adverbial (especially with prepositional prefix) always:—alway(-s), ancient (time), any more, continuance, eternal, (for, (n-)) ever(-lasting, -more, of old), lasting, long (time), (of) old (time), perpetual, at any time, (beginning of the) world (+ without end).
Genesis 3:22 (KJV) And
the LORD God said, Behold, the man is become as one of us, to know good and evil: and now, lest he put forth his hand, and take also of the tree of life, and eat, and live for ever: