For God so loved the world that He gave His only begotten Son, that whoever believes in Him should not perish but have everlasting life. For God did not send His Son into the world to condemn the world, but that the world through Him might be saved.
Jesus is the Son of God--God in the flesh. Believing in His name is the key component to rebirth in the Kingdom. These things I have written to you who believe in the name of the Son of God, that you may know that you have eternal life, and that you may continue to believe in the name of the Son of God.
By believing these things an individual obtains eternal life. But as many as received Him, to them He gave the right to become children of God, to those who believe in His name: who were born, not of blood, nor of the will of the flesh, nor of the will of man, but of God.
John 20:31 John 3:16-17 I John 5:13 John 1:12-13