John 3:18 Whoever believes in him is not condemned, but whoever does not believe is condemned already, because he has not believed in the name of the only Son of God. ESV #Bible
To believe in Jesus is to consider, to trust in, to rely on, to depend on, be assured of and have faith in Jesus to be the one and only unique Son of God, the Messiah.
It’s understandable in the beginning that being moved by a desirous hunger in our hearts, we believe by our God given faith in Jesus.
As time goes on in our relationship with Jesus through His Holy Spirit we gain experience with and a knowledge of Jesus. As we study the Word of God we learn more about our wonderful Saviour, and our belief grows stronger.
If one chooses through examination, or opinion to not believe, as they live, they are condemned all ready. There is no need for them to die or stand before God pleading, because their disbelief is the witness and proof of their condemnation.
God has left the decision entirely up to us, we make the choice to believe or disbelieve. So there is no blame that can be held against Jesus, or God, we hold the entire responsibility to live forever, or die, meaning separated forever from Jesus.
If you feel inside that God is real, than the only way to God is through Jesus.
Believe and be saved from the deadly separation that awaits those who disbelieve.