How do we know that the doctrine of representative headship in Adam is true?

The doctrine of representative headship, whereby Adam represents humanity in his sin, is clearly articulated in scriptures such as Romans 5:12, which explains that through one man, Adam, sin entered the world, leading to death for all. This representation is foundational in Reformed theology, highlighting that just as sin and death came through Adam, so too, salvation and life come through Christ, the last Adam, as described in 1 Corinthians 15:22. This biblical framework shows that God deals with humanity through representatives, emphasizing our connection to both Adam and Christ in the narrative of salvation.