Why is the sinlessness of Christ important for Christians?

The sinlessness of Christ is vital for Christians because it confirms His ability to serve as the perfect mediator between God and man. As mentioned in Hebrews 7:26, 'For such an high priest became us, who is holy, harmless, undefiled, separate from sinners.' This sinlessness means that Jesus was not only a blameless sacrifice but also one who could fulfill God's law perfectly. If Christ had sinned, He would have needed to atone for His own sins before atoning for ours. Therefore, His purity is the foundation of the doctrine of salvation: that He bore our sins so that we could be declared righteous in God's eyes. His sinlessness gives us assurance of our salvation because it upholds God's justice and mercy simultaneously.