There is a difference between hearing about, believing in Christ and receiving Him. Only those who receive Him become God’s children. Jesus is the only way to God. What does it mean to receive Jesus? “But as many as received Him, to them He gave the right to become children of God…” John 1:12
He was not the light, but came to bear witness about the light. John was merely the forerunner who announced the coming Messiah. Like John, we bear witness to the light but it is Christ in us which shines! Everyone that sees us – sees a few gleams of the true Light.