For whatever it's worth, I agree with almost all of the points of your post with the following few exceptions:
I would suggest that because this is an eternal, heavenly promise concerning a spiritual and eternal land given solely by God’s unconditional act, those who place their faith in Jesus do so only because God first included them in that promise, with their faith coming from it as a result. In other words, faith is not a prerequisite for someone to satisfy in order to be placed under the promise. If faith were a transactional requirement for receiving the promise, then the promise would still depend on us, making it a performance/works-based promise. If we had to produce faith to obtain it, then we —not God—would have to satisfy it. However, the promise was given and obtained only by God's grace
The Bible teaches that the heavenly inheritance belongs to Jesus alone because He is the only one who qualified for it (Galatians 3:16). Therefore, it cannot be earned by our faith. Jesus fully satisfied the Abrahamic covenant, and God, in His abundant mercy and grace, sovereignly chose to include certain people under it - those whom He had appointed for it. Human performance is neither required nor permitted because Jesus alone is the Savior, man is not.
I think that I have to agree with you on a deeper level that faith itself must be an act of God, or the spirit of God working in us.
If that was not the case we would be bringing our own pride to God for having done our part of the job.
Rightly or wrongly I have adopted the habit of speaking in terms of mans responsibility regarding faith however, because from our point of view this is how it appears when trials of faith come our way.
We seem to have so many choices other than being faithful.
I see no reason why the sovereignty of God and the responsibility of man should have ever been a cause for theological division, because both realities exist at the same time.
I think the earthly land promises were given by God while under the name of Abram, not Abraham. However, the promise for the spiritual land (spiritual Israel) was given to Abraham, not Abram, and was satisfied by Jesus Christ, not David and Solomon
That is an interesting thought.
I notice that Abram was given the name Abraham in Genesis 17:5, and called the father of many nations.
The everlasting covenants were given in the verses immediately after that.