How do we know that Christ is our representative in salvation?

Christ functions as our representative in salvation, as explained in Romans 6, where believers are portrayed as having been united with Christ in His death and resurrection. This means that when He died, we died; when He was raised, we were raised with Him. This union assures us that Christ’s obedience and sacrifice cover all our sins. Thus, through His imputed righteousness, we are justified before God. As the preacher emphasized, Christ's identity as both God and man is essential for our redemption, as He bridges the gap between humanity and God, becoming our mediator.