Jesus asked, “Whom say you that I am?” Simon Peter answered, “You art the Christ, the Son of the living God” (Matthew 16:15–16).
Who did Jesus claim to be? “I and the Father are one” (John 10:30), and “I tell you the truth,” Jesus answered, “before Abraham was born, I am!” (John 8:58).
Thomas declared to Jesus, “My Lord and my God” (John 20:28). Jesus did not correct him. Paul describes Him as, …our great God and Savior, Jesus Christ (Titus 2:13). God said, But about the Son he says, Your throne, O God, will last forever and ever, and righteousness will be the scepter of your kingdom (2 Peter 1:1). And Isaiah said 700 years before Christ, For to us a child is born, to us a son is given, and the government will be on his shoulders. And he will be called Wonderful Counselor, Mighty God, Everlasting Father, Prince of Peace (Isaiah 9:6).
The Old Testament contains approximately 312 specific prophecies about Jesus Christ. To date, over 300 of these prophecies have been fulfilled. Only a God that knows the future could make over 300 prophecies, hundreds and even thousands of years before they occurred, and never once have any ever been wrong.
We have the testimony of the 312 prophecies, the apostles, God, Holy Spirit, Jesus, and the numerous wonders and miracles Jesus performed all declaring that He is the Son of God.
Does it matter if Jesus is God? If Jesus was not God, He would not have been sinless and His sacrifice on the cross would have been of no value (1 John 2:2). Only a sinless God could pay such a penalty (Romans 5:8, 2 Corinthians 5:21). Only Jesus provided the way for salvation. Jesus said, No one comes to the Father except through me (John 14:6).
As the Son of God, Jesus put aside His Godly powers, lived a perfect life free of sin, and redeeming those who receive, by paying for our sins on the cross as the Son of Man.