@thesearcher ** If Adam had not sinned, what would be the outcome for every single human being on the earth? Everlasting life on a paradise earth - end of story - because that's exactly what Jehovah intended!***
Adam and Eve would have been transformed "changed" given suitable bodies for an immortal state. Jesus demonstrated this change in HIS transfiguration, as he put on mankind's intended glory.
Adam and Eve were created mortal with conditional immortality IF they were to eat from the tree of Life aka Christ.......however, our road to glory as you said was preordained through Christ's death and resurrection....
4 For he chose us in him before the creation of the world to be holy and blameless in his sight. In love 5 he[b] predestined us for adoption to sonship[c] through Jesus Christ, in accordance with his pleasure and will— 6 to the praise of his glorious grace, which he has freely given us in the One he loves. 7 In him we have redemption through his blood, the forgiveness of sins, in accordance with the riches of God’s grace 8 that he lavished on us. With all wisdom and understanding, 9 he[d] made known to us the mystery of his will according to his good pleasure, which he purposed in Christ, 10 to be put into effect when the times reach their fulfillment—to bring unity to all things in heaven and on earth under Christ.
1 Corinthians 15:
If there is a natural body, there is also a spiritual body. 45 So it is written:“The first man Adam became a living being”[f]; the last Adam, a life-giving spirit. 46 The spiritual did not come first, but the natural, and after that the spiritual. 47 The first man was of the dust of the earth; the second man is of heaven. 48 As was the earthly man, so are those who are of the earth; and as is the heavenly man, so also are those who are of heaven. 49 And just as we have borne the image of the earthly man, so shall we[g] bear the image of the heavenly man.
Now Adam is a symbol, a representation of Christ, who was yet to come
10 In bringing many sons and daughters to glory, it was fitting that God, for whom and through whom everything exists, should make the pioneer of their salvation perfect through what he suffered. 11 Both the one who makes people holy and those who are made holy are of the same family. So Jesus is not ashamed to call them brothers and sisters.
Shalom in Christ friend :)