The apostle Paul elaborates on the differences between the resurrection of the two groups of people as a
comparison between the natural body and the spiritual body: Adam verses Jesus, living being verses life
giving spirit, and origin from the dust of the earth verses from heaven.
With these comparisons, Paul defines two classes of human beings:
1) those who are of Adam will bear the body and likeness of the earthly man and
2) those who are of Jesus will bear the body and likeness of the heavenly Man
(1 Cor 15:45-49).
The significance is that only the one with a spiritual body will enter the kingdom of God.