Jesus taught a spiritual kingdom only. The proof? Try to find one passage in the gospels where Jesus says the kingdom is anything but spiritual.
Jesus said for now my kingdom is not of this earth and when asked if he would restore the kingdom at that time in acts Jesus noted that was in the Fathers authority. Psalm 110 the LORD said to my Lord sit at my right hand until I make your enemies your footstool.
For unto us a Child is born,
Unto us a Son is given;
And the government will be upon His shoulder.
And His name will be called
Wonderful, Counselor, Mighty God,
Everlasting Father, Prince of Peace.
7 Of the increase of
His government and peace
There will be no end,
Upon the throne of David and over His kingdom,
To order it and establish it with judgment and justice
From that time forward, even forever.
The zeal of the Lord of hosts will perform this. When Gabriel told Mary Jesus would sin on the throne of David he was tying that promise to this one. That throne has not been established with judgment and justice from that time, ( when he takes the throne judgement and justice prevail)
Judgment and Justice have not prevailed for the last 2000 years. The Justice starts when the throne is taken we have witnessed 2000 years of injustice how can Jesus be ruling on Davids throne now?