Why is the concept of Jesus being the God-man important?

The doctrine of the God-man is fundamental in Reformed theology because it underscores that Jesus is both fully God and fully man. Hebrews 2:10-14 clarifies that He had to take on human flesh to be a merciful and faithful high priest, making reconciliation for the sins of His people. This dual nature enables Him to effectively represent humanity while also possessing the divine authority to atone for sins. His singular perfection guarantees that His sacrifice is sufficient for all whom He represents, ensuring that by faith, we are clothed in His righteousness and fully accepted by God.