What happened to the human race because of Adam as our head?

Adam functioned as the head of the natural progeny of the human race. Through his headship, the human race was plunged into sin, and that sin precipitated death. Scripture contrasts this first man with the last Adam, who is a life-giving spirit and the Lord from heaven.

Les explains that Scripture presents two federal heads. Adam is the head of the natural progeny of the human race, and his headship plunged us into sin, and sin precipitated death. Les directs listeners to compare Scripture with Scripture, pointing to Romans 5:12 and to 1 Corinthians 15:45-46. There, the first man, Adam, was made a living soul, while the last Adam was made a quickening or life-giving spirit. The first man is of the earthy; the second man, the last Adam, is the Lord from heaven.

Romans 5:12

Wherefore, as by one man sin entered into the world, and death by sin; and so death passed upon all men, for that all have sinned:

How did Adam's role as head of the human race affect us?

Adam served as the head of the natural human race, and his role plunged us into sin. That sin precipitated death, so his headship brought sin and death to all his descendants. Scripture sets him as one federal head, contrasted with the last Adam, the life-giving spiritual head.