How do we know Christ's work is important for salvation?

The significance of Christ's work is rooted in His unique role as the God-man mediator. According to 1 Timothy 2:5, there is 'one mediator between God and man, the man Christ Jesus.' His divine nature ensures that His righteousness is acceptable to God, while His humanity allows Him to represent mankind as our federal head. In Romans 5:18, it is stated that by the offense of one man, judgment came to all, but through the righteousness of one, many will be justified. Thus, Christ's work not only addresses our sin but also fulfills God's justice, allowing believers to be declared righteous before Him.