To claim that since the Lord Jesus was “given” this authority/power it proves that He is not God actually destroys monotheism. Since the Lord Jesus has universal power (which means He is OmnipotentAlmighty), that would mean that God the Father created another Omnipotent being.
Not at all. The delegation of YHWH’s authority to rule over the nations is entirely in keeping with Old Testament thought about kingship. That’s why Psalm 110 proved so important both for Jesus and for the early church:
The LORD says to my Lord: “Sit at my right hand, until I make your enemies your footstool.” The LORD sends forth from Zion your mighty scepter. Rule in the midst of your enemies! (Ps. 110:1–2)
God did not create another omnipotent being. He gave the authority to rule (for the sake of his body, the church: Eph. 1:22-23) to the “son” whom he raised from the dead and seated at his right hand. That hardly destroys monotheism.
I can understand why later theologians felt the need to roll this apocalyptic narrative into the smooth ball of a Trinitarian definition of the godhead, but exegesis has to run that process backwards.