How do we know that propitiation is necessary for salvation?

The necessity of propitiation is found throughout scripture, indicating that God's justice must be satisfied before redemption can occur. In 1 John 2:2, it states that Jesus Christ is the propitiation for our sins. This act is central to the gospel because it assures that God’s wrath, which is directed at sin, has been turned away through Christ’s sacrifice. Without this propitiation, sinners remain under divine wrath. Thus, for God to reconcile sinners to Himself, the demands of His justice must be met, which is precisely what Christ accomplished at the cross.