1) GOD's Universal Kingdom in which He rules directly over all creation since the beginning:
Psa 103:19 The LORD hath prepared his throne in the heavens; and his kingdom ruleth over all.
Psa 93:2 Thy throne is established of old: thou art from everlasting.
2) GOD's Theocratic Kingdom on earth which is mediatorial and progressive and culminates in the Davidic Messianic Kingdom promised in prophecy.
Dan 4:17 This matter is by the decree of the watchers, and the demand by the word of the holy ones: to the intent that the living may know that the most High ruleth in the kingdom of men, and giveth it to whomsoever he will, and setteth up over it the basest of men.
2Sa 7:8 Now therefore so shalt thou say unto my servant David,
2Sa 7:12 And when thy days be fulfilled, and thou shalt sleep with thy fathers, I will set up thy seed after thee, which shall proceed out of thy bowels, and I will establish his kingdom.
2Sa 7:13 He shall build an house for my name, and I will stablish the throne of his kingdom for ever.
Isa 9:6 For unto us a child is born, unto us a son is given: and the government shall be upon his shoulder: and his name shall be called Wonderful, Counsellor, The mighty God, The everlasting Father, The Prince of Peace.
Isa 9:7 Of the increase of his government and peace there shall be no end, upon the throne of David, and upon his kingdom, to order it, and to establish it with judgment and with justice from henceforth even for ever. The zeal of the LORD of hosts will perform this.
Act 2:30 Therefore being a prophet, and knowing that God had sworn with an oath to him, that of the fruit of his loins, according to the flesh, he would raise up Christ to sit on his throne;
Jer 23:5 Behold, the days come, saith the LORD, that I will raise unto David a righteous Branch, and a King shall reign and prosper, and shall execute judgment and justice in the earth.
Jer 23:6 In his days Judah shall be saved, and Israel shall dwell safely: and this is his name whereby he shall be called, THE LORD OUR RIGHTEOUSNESS.
3) Christ leaves earth and goes into heaven to receive authority for His Kingdom.
Luk 19:12 He said therefore, A certain nobleman went into a far country to receive for himself a kingdom, and to return.
In the interregnum, Christ is head of the Church, the Body of Christ, and rules in the believer's hearts as they submit to the Holy Spirit.
Col 1:13 Who hath delivered us from the power of darkness, and hath translated us into the kingdom of his dear Son:
Christ returns to earth as King, takes His rightful Davidic throne and rules over the nations.
Mat 25:31 When the Son of man shall come in his glory, and all the holy angels with him, then shall he sit upon the throne of his glory:
Mat 25:32 And before him shall be gathered all nations: and he shall separate them one from another, as a shepherd divideth his sheep from the goats:
Mat 25:33 And he shall set the sheep on his right hand, but the goats on the left.
Mat 25:34 Then shall the King say unto them on his right hand, Come, ye blessed of my Father, inherit the kingdom prepared for you from the foundation of the world:
The Scriptures do not conflate these distinctions.
Men do.