Will all my real Kingdom Citizens please standup

There are a great deal of “Christians” who are guilty of impersonating an officer of the Kingdom of Heaven; such is treason. The only legal doctrine for any Christian to teach, preach and live (although one should first learn and live before one teaches) is the Kingdom of Heaven/God (the Kingdom of Heaven encompasses all other sound biblical doctrine, and all other doctrine must emanate from the Kingdom of Heaven God); anything else is treason (after as the message of the Kingdom is the who counsel of God).

Acts 20:25-27 King James Bible

And now, behold, I know that ye all, among whom I have gone preaching the kingdom of God, shall see my face no more. Wherefore I take you to record this day, that I am pure from the blood of all men. For I have not shunned to declare unto you all the counsel of God.

If you are a Christian it means you are a follower of Christ (at least that is the traditional understanding); last I check, Christ is the King who preached, taught and lived Kingdom. He also gave the mandate to preach Kingdom, and stated that it would be the preaching of the Kingdom that would usher in His return.

Matthew 24:14 King James Bible And this gospel of the kingdom shall be preached in all the world for a witness unto all nations; and then shall the end come.

Almost everywhere we find the suffix “ian” it refers to a people who are citizen of a specific place;

Philippians: A native or inhabitant of ancient Ephesus.
Colossians: [Latin Colossēnsēs, inhabitants of Colossae, from Colossae, Colossae, from Greek Kolossai.]
Galatian - a native or inhabitant of Galatia in Asia Minor (especially a member of a people believed to have been Gauls who conquered Galatia in the 3rd century BC)
Asian - a native or inhabitant of Asia
African - a native or inhabitant of Africa
American - a native or inhabitant of the United States

(Definitions from thefreedicitionary.com)

The root tells us that specific place. If we are to be consistent with the use of this suffix; being a Christian properly means we are citizen to the land of Christ, which is the Kingdom of Heaven.