How do we know that salvation through Christ alone is true?

The truth of salvation through Christ alone is well supported in the Bible, particularly in Acts 15, where a council of apostles and elders unanimously concludes that faith in Jesus is the only path to salvation. Peter's declaration that both Jews and Gentiles are saved by grace through faith, as noted in verses 7-11, exemplifies this foundational truth. Additionally, the letters sent to the churches confirm that no works of the law, such as circumcision, are required for salvation, underscoring the sufficiency of Christ's atoning sacrifice. This teaching is foundational for understanding how God saves sinners.