When God created Adam, He did so from the 'dust of the ground'. Yet Adam was a human being. We believe Jesus is a Human Being now glorified in an altered body and in Heaven in that physical body. He seed remained within Him only leaving His physical body upon death, a death He allowed as the single, most efficacious sacrifice for us and for all those who will receive new life by His Grace, stretching all the way back to Adam and forward to our day. HIS SEED is the great clue we ought not miss in this discussion.
Paul was writing to Galatian converts to Christianity, not to Jews who would naturally claim to be of the seed of Abraham.
Gal 3:16 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.
1 John 3:9 Whosoever is born of God doth not commit sin; for His seed remaineth in im: and he cannot sin, because he is born of God.
Genesis 3:15 And I will put enmity Between you and the woman, And between your seed and her seed; He shall bruise you on the head, And you shall bruise him on the heel." [What or who is referred to as the 'seed' of satan?]