Why is the concept of one man saving others important in the Bible?

Throughout Scripture, God often utilizes one man to accomplish His redemptive purposes. This motif is clearly seen in figures like Noah, who saved his household from the flood, and ultimately in Christ, who saves His people from their sins. Romans 5:12 teaches us that sin entered the world through one man, Adam, but through one man, Jesus Christ, righteousness is offered to the elect. This underscores the extraordinary grace and sovereignty of God in salvation; He designs and executes His plan through chosen individuals, highlighting the necessity of Jesus as the one true Redeemer.