The sermon examines Genesis chapter 5 to highlight the theological significance of the genealogies recorded from Adam to Noah. It identifies Seth as the appointed seed who replaces Abel, establishing the messianic line through which Christ would come. The teaching contrasts the first Adam, who was created in God's image but lost it through sin, with the last Adam, Jesus Christ, who is a quickening spirit. The speaker explains that humanity is born with a dead spirit due to Adam's fall and requires spiritual regeneration to be made alive by God. This spiritual rebirth is described as a divine operation that restores the believer to a right relationship with God, distinct from the physical lineage recorded in the Old Testament.