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We believe that God has essentially given Jesus functional equality with Himself, and that only with regard to the throne is God greater than Jesus (Gen. 41:40; Matt. 28:18).
As you can see here, there is a heirarchial system in the unitarians belief of God the Father to His Son. And there is the idea that the Father gives Jesus his power. This is a heresy. The truth of this mistaken assumption is that the Godhead in eternity past set up a council with Himself to make the Father the authority and the Son submission in the Godhead. There was no heirachy in eternity past.