Because, if you confess with your mouth that Jesus is Lord and believe in your heart that God raised him from the dead, you will be saved. Romans 10:9 ESV
(Greg Smith) The doctrine of regeneration is the belief that, in order for a person to be saved and have eternal life in Heaven, they must be born again spiritually by the Holy Spirit. This belief is taught in the Bible, particularly in the New Testament, with unmistakable force and clarity.
There are two kinds of people in the world. Those who have been born dead in Adam and those who have been born again into new and everlasting life in Christ.
In John 3:3, Jesus tells Nicodemus, “Truly, truly, I say to you, unless one is born again he cannot see the kingdom of God.” This passage makes it clear that, in order for a person to enter into the kingdom of God, they must be reborn spiritually. This IS the gospel, the good news. Whatever may call itself “Christianity” without it… well… isn’t.