How do we know the doctrine of salvation in Christ alone is true?

The doctrine of salvation in Christ alone is supported by numerous scriptural passages affirming that Jesus Christ is the only way to salvation. Acts 4:12 asserts, 'Neither is there salvation in any other: for there is none other name under heaven given among men, whereby we must be saved.' The consistency of this message across the New Testament highlights the unique role of Christ as the sole mediator between God and man. Additionally, Pauline epistles repeatedly underscore that salvation is a gift of grace through faith, resting in Christ's completed work, not human efforts or additions.