How do we know Christ alone saves?

Christ alone saves because salvation is by grace through faith and not of works. Ephesians 2:8-9 clearly states that we are saved by grace through faith, and this not of ourselves; it is the gift of God, not of works, lest any man should boast. This foundational truth highlights the belief in the efficacy of Christ’s work on the cross. His sacrifice was complete and satisfactory, removing the burden of sin from those who believe, thereby affirming the doctrine of salvation by grace alone.