How do we know Christ's sacrifice is effective for our salvation?

Christ's sacrifice is effective for our salvation because He is the Lamb of God who was without blemish, as indicated in Exodus 12:5 and ultimately fulfilled in Christ. The effectiveness of His atonement is not contingent upon our feelings or perceptions but is grounded in the covenant promise of God. When we trust in Christ’s blood, we find that it makes atonement and cleanses us from all unrighteousness. The Apostle Paul reminds us of this truth in Romans 5:8, showing that while we were still sinners, Christ died for us, thus proving the potency of His sacrifice. Therefore, it is faith in His completed work that assures us of our salvation.