It is not the theologian or their theology that makes up doctrine, but it is the Word of God that does so.
It is the New Covenant that creates the Church and determines who is in it. And it is Christ Jesus our savior, the savior of all mankind — of whosoever will turn to Him, who gives us the promised New Covenant.
When did this covenant come to life? In the Old Testament times it was just a promise.
Jeremiah 31:31 “Behold, days are coming,” declares the LORD, “when I will make a new covenant with the house of Israel and with the house of Judah, (NASB1995)
It remained as such until the Resurrection of the Christ, the Messiah, Jesus The Son of God; then it was real, made alive in the blood of God Himself.
Luke 22:20 And in the same way [He took] the cup after they had eaten, saying, “This cup which is poured out for you is the new covenant in My blood. (NASB1995)
Before this time the kingdom of God was at hand, now that the savior had Risen from the dead it was really here, but it was not yet come as it is in Heaven.
28 “Truly I say to you, there are some of those who are standing here who will not taste death until they see the Son of Man coming in His kingdom.”
Over 500 souls witnessed the Resurrection and Jesus ushering in His Spiritual kingdom, still Heavens governance had not yet Come on earth. Matthew 16:28NASB
Revelation 20:4 Then I saw thrones, and they sat on them, and judgment was given to them. And [I saw] the souls of those who had been beheaded because of their testimony of Jesus and because of the word of God, and those who had not worshiped the beast or his image, and had not received the mark on their foreheads and on their hands; and they came to life and reigned with Christ for a thousand years. (NASB2020)
Our prayer remains “thy will be done on earth as it is in Heaven. This was taught us by the Church founders, who were taught it by the Lamb of God Himself, our savior. His will in complete fulfillment is not to this very day being done as it is in Heaven.
That very prayer will be fulfilled when God sends His Son a second time. Come Lord Jesus in You return. It is then; when Heavens working out of God’s will, will be done in earth. That is when God’s laws for this earth will take effect through His Son. Then is when He will rule with an iron Rod, and administer Justice. His bride beside Him.