How do we know Jesus is God the Son and not God the Father? Very simply when the Pharisees were accusing Jesus of claiming to be God because He was forgiving sins and only God can forgive sins. Thomas put his hand in Jesus' side saying, my Lord and my God. Jesus said He is the Alpha and the Omega, beginning and ending. He even said nothing exists that exists without Him having created it. Jesus said He makes all things knew (Rev. 21.6). God does this. Jesus said before the foundations of the world and before Abraham, that is, before creation He existed. He is the uncreated Creator. Thus, He is God the Son. Jesus said, "I will be his God" (v.7). "And when I saw him, I fell at his feet as dead. And he laid his right hand upon me, saying unto me, Fear not; I am the first and the last. I [am] he that liveth, and was dead; and, behold, I am alive for evermore, Amen; and have the keys of death and hades" (1.17,18). God the Father did not die, but God the Son did.