How do we know the death of Christ is sufficient for salvation?

The sufficiency of Christ's death is central to the Gospel. In 1 Corinthians 15:3, it is explicitly stated that Christ died for our sins 'according to the Scriptures.' This phrase not only reiterates the historicity of His death but also links it to God's plan of salvation foretold in the Old Testament. The completeness of Christ's sacrificial death is further solidified by His resurrection, showcasing that He conquered sin and death, which further assures us that His sacrifice was not merely sufficient but perfect and complete for our salvation.