He who believes in him is not judged. He who doesn't believe has been judged already, because he has not believed in the name of the one and only Son of God.
True, no person has ever gone up into heaven to learn all about God and his ways, but Jesus Christ has come down from heaven and shown people what God is like. He is God’s gift to the world. His death on the cross is God’s way of salvation, and if people under condemnation turn to him and believe, they will have eternal life (John 3:13-15).