Do You Believe in Jesus?

Christian churches send evangelists all over the world to proclaim the gospel to people haven't heard it yet. Judas went to his own place he killed himself he betrayed Jesus and he didn't repent verse 19 of the book of the Psalms. The bible tells us to test ourselves to work out our salvation with fear and trembling do we actually believe in Jesus? Do we confess him as Lord and Savior our repenting of our sins or do we believe in Jesus in some intellectual way the same way that the devil does, says John 3:16.