Webb has no right to regard as analogy what God regards as truth. This definition of regeneration, being a natural human concept, is contrary to the divine revelation. According to the Bible regeneration involves termination and germination. Through regeneration the Spirit of God brings the divine life with the divine nature into the human spirit, causing it to become enlivened.
Regeneration is necessary for two reasons.
Therefore, we need to be regenerated and receive another life. The second, greater, and primary reason is that we need to be regenerated simply because, as human beings with a human life, we lack the divine life, the eternal life of God. When we were created by God, we obtained only a created life, not the uncreated life of God. Since God's intention in His creation of man was that man would receive eternal life and fulfill His purpose by growing to maturity in this life, we would need the second aspect of regeneration even if we had not sinned and even if our life had not become corrupt and evil. Regeneration is necessary because it is the means by which we obtain the eternal life of God for the fulfillment of the eternal purpose of God.