How can they preach it (the undivided kingdom) when they run from anything to the left of the book Matthew? They do not understand the gospel is about Re-uniting the divided kingdoms and have true peace and safety in a Marriage Covenant. The entire Bible eludes to or directly confirms it is all about the COVENANT. (See Hebrews 8:8 and Jeremiah 31:31)
A King needs a Kingdom of citizens who obey/not a bunch of rebels
A King needs LAWS to rule by and a court of hearings and judgments.
A King needs LAND, Seas and properties
A King needs a SIGN for His Kingdom.
A King needs lower kings and also Priests to Serve on behalf of the Kingdom.
But again, very few will enter into the Kingdom because they are just hung up on doing heathen/pagan ways and heathen/pagan practices.
Mat 7:21 Not every one that saith unto me, Lord, Lord, shall enter into the kingdom of heaven; but he that doeth the will of my Father which is in heaven.
Mat 7:22 Many will say to me in that day, Lord, Lord, have we not prophesied in thy name? and in thy name have cast out devils? and in thy name done many wonderful works?
Mat 7:23 And then will I profess unto them, I never knew you: depart from me, ye that work iniquity.
Mat 12:50 For whosoever shall do the will of my Father which is in heaven, the same is my brother, and sister, and mother.
Luk 8:21 And he answered and said unto them, My mother and my brethren are these which hear the word of God, and do it.
Exo_13:9 And it shall be for a sign unto thee upon thine hand, and for a memorial between thine eyes, that the LORD'S law may be in thy mouth: for with a strong hand hath the LORD brought thee out of Egypt.
Exo_31:13 Speak thou also unto the children of Israel (ALL 12 TRIBES), saying, Verily my sabbaths ye shall keep: for it is a sign between me and you throughout your generations; that ye may know that I am the LORD that doth sanctify you.