Vanderhoven
Regarding when Jesus became king, McDaniel writes:
The truth is, Jesus became king when He ascended to heaven in AD 30 and established the church. Before that time, Jesus (along with others) promised that the kingdom was at hand (cf. Matt. 4:17). The first century was the “fullness of the time” (cf. Gal. 4:4; Eph. 1:10), the predicted age of the Roman Empire when God would establish His eternal kingdom (cf. Dan. 2:44; 7:13-14). When the Lord returned to heaven, He possessed (and possesses) all authority (cf. Matt. 28:18), sat down on His Father’s throne (cf. Heb. 1:1-3; Eph. 1:18-23), and admitted the saved into His kingdom (cf. Col. 1:12-14).
So Fisherman and Scholar
Notice that Paul and all Christians at the time were saved and had been transferred from darkness into an already existing kingdom, the Kingdom of Christ in century one.
Colossians 1:13 KJV — Who hath delivered us from the power of darkness, and hath translated us into the kingdom of his dear Son:
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So how do you explain Daniel 2:44 and other related texts in Daniel that refer to God's kingdom as fully developed in Daniel 4?
scholar JW