What is the difference between believing in Jesus and not believing in Him?？

Believing in Jesus → Inner acceptance → God's life (eternal life) = Rebirth

"A person who has the Son of God has life; whoever does not have the Son of God does not have life." 1 John 5:12

Just like a car that cannot function without gasoline or charging, a person without God's love is merely a walking corpse—lacking vitality and radiance—unable to live out God's goodness and glory.

"Therefore I tell you, you will die in your sins. If you do not believe that I am the Christ, you will die in your sins." John 8:24 Only when God is within a person can they live out God's glory! This is also the purpose for which God created man.