Jesus answered, “I tell you the truth, no one can enter the kingdom of God unless he is born of water and the Spirit.
All of us are born of water. We are first raised in the water of our mothers womb, and the majority of our body is even made up of water. The Messiah did not demanded Nicodemus to climb back into his mothers womb, and be re-birthed physically. He told the Torah teacher to let the Spirit of God reveal that He was facing the Messiah, not only a miracle man. The known and respected Jewish teacher was facing the only gate to Heaven. The only Son of God who can take away our eternal punishment for sin.