Michael Heiser in his book “The Unseen Realm” in a summary statement says:
“The kingdom of God is already a present reality but isn’t yet realized. John the Baptist announced it. He introduced its king. Jesus preached its arrival and demonstrated what life in God’s Edenic world could and would be like; no disease, no infirmity, no demonic opposition.
The New Testament makes the rebirth of a struggle thousands of years in the making. The people of God have been isolated and under foreign rule. The divine presence of the days of Moses, David, Salomon, and the prophets is nothing but memory. When angels visit Mary and Zechariah to announce the impending births of Jesus and John, centuries of divine silence are broken. Thirty years later, Judea will explode. The unseen spiritual conflict is even more volatile.
Every chapter of the New Testament provides a glimpse into this conflict. The cosmic geography of the Old Testament is evident in the New. Where Jesus goes and what he says and does when he gets there is framed by confrontation with unseen powers. The conflict pursues him unto death – as God had planned, and as Jesus provoked. THE KINGDOM OF GOD ESTABLISHES A PERMANENT BEACHHEAD AT THE FOOT OF THE CROSS AND THE DOOR OF THE EMPTY TOMB.