How do we know that Jesus is the Savior as the Bible claims?

We know Jesus is the Savior because His life and mission were foretold by the prophets, and He fulfilled every requirement of those prophecies. Matthew 1:21 proclaims that Jesus will save His people from their sins, embodying the promises made throughout Scripture. The concept of Him being the eternal Son, who came to redeem humanity, aligns with the prophecies found in Isaiah, particularly Isaiah 53, which describes the suffering servant who bears the iniquities of many. Moreover, His atoning sacrifice on the cross solidifies His role as Savior, evidenced by His resurrection, which proves His victory over sin and death. Without these fulfilled prophecies and His defining actions, the identity of Jesus as Savior would lack the validation required by the Scriptures.