Before the man created in the image of God, was created and before God made the help meet for the man created in the image of God, by taking her from the man the following had already been determined: 1 Peter 1:18-20 Forasmuch as ye know that ye were not redeemed with corruptible things, silver and gold, from your vain conversation by tradition from your fathers; But with the precious blood of Christ, as of a lamb without blemish and without spot: Who verily was foreordained before the foundation of the world, but was manifest in these last times for you.
This lamb, foreordained before the foundation of the world would be a man brought forth by a woman, a virgin, who had been conceived by God Holy Spirit within her.
Why?
And Jehovah God layeth a charge on the man, saying, `Of every tree of the garden eating thou dost eat; and of the tree of knowledge of good and evil, thou dost not eat of it, for in the day of thine eating of it -- dying thou dost die.' Gen 2:16,17 YLT
It was already foreordained the lamb would die. Not if something took place. The lamb was going to die and redeem man. From what?
I will ransom them from the power of the grave; I will redeem them from death: O death, I will be thy plagues; O grave, I will be thy destruction: repentance shall be hid from mine eyes. Hosea 13:14
Forasmuch then as the children are partakers of flesh and blood, he also himself likewise took part of the same; that through death he might destroy him that had the power of death, that is, the devil;
And the great dragon was cast out, that old serpent, called the Devil, and Satan, which deceiveth the whole world: Rev 12:9
I do not think it was Adam.
Adam did what God knew Adam would do and the lamb was born: This one is he who did come through water and blood -- Jesus the Christ, not in the water only, but in the water and the blood; 1 John 5:7 YLT