How do we know the atonement of Christ is sufficient for our redemption?

The sufficiency of Christ’s atonement is grounded in the theological conviction that He bore our sins in His body and fully satisfied the demands of the law. Romans 8:3-4 highlights this by indicating that 'what the law could not do'—which is to redeem due to our inability—'God sending His own Son' did achieve by condemning sin in the flesh. This means believers can trust completely in His sacrifice as being more than enough, for He not only faced the punishment due for our sins but also lived a perfectly righteous life on our behalf, thus fulfilling the law's requirements.