God is ever unchanging. Then how can the Lord Jesus change His name to Almighty God?

The answer from God’s word:

“Each time God arrives on earth, He shall change His name, His gender, His image, and His work; He does not repeat His work, and He is always new and never old. When He came before, He was called Jesus; could He still be called Jesus when He comes again this time? When He came before, He was male; could He be male again this time? His work when He came during the Age of Grace was to be nailed to the cross; when He comes again will He still redeem mankind from sin? Will He still be nailed to a cross? Would that not be a repetition of His work? Did you not know that God is always new and never old? There are those who say that God is immutable. That is correct, but it refers to the immutability of God’s disposition and substance. Changes in His name and work do not prove that His substance has altered; in other words, God will always be God, and this will never change. If you say that the work of God always stays the same, then would He be able to finish His six-thousand-year management plan? You merely know that God is forever unchanging, but do you know that God is always new and never old? If the work of God never changed, then could He have brought mankind to today? If God is immutable, then why is it that He has already done the work of two ages? His work is always progressing forward, and so His disposition is gradually revealed to man, and what is revealed is His inherent disposition. In the beginning, God’s disposition was hidden from man, He never openly revealed His disposition to man, and man had no knowledge of Him, so He used His work to gradually reveal His disposition to man, but this does not mean that His disposition changes in each age. It is not the case that God’s disposition is constantly changing because His will is always changing. Rather, because the work of God is carried out in different ages, His inherent disposition in its entirety is gradually revealed to man, so that man is able to know Him. But this is by no means proof that God originally has no particular disposition and His disposition has gradually changed with the passing of the ages—such belief is nonsense. God reveals to man His inherent, particular disposition, what He is, according to the passing of the ages. The work of a single age cannot express the entire disposition of God. And so, the words ‘God is always new and never old’ are in reference to His work, and the words ‘God is immutable’ are in regard to what God inherently has and is. Regardless, you cannot define the six-thousand-year work in one point, or portray it with mere static words. Such is the stupidity of man. God is not as simple as man imagines, and His work will not stop in one age. Jehovah, for example, will not always stand for the name of God; God also does His work under the name of Jesus, which is a symbol of how God’s work is always progressing forward.

God will always be God, and will never become Satan; Satan will always be Satan, and will never become God. God’s wisdom, God’s wondrousness, God’s righteousness, and God’s majesty shall never change. His substance and what He has and is shall never change. His work, however, is always progressing forward, always going deeper, for God is always new and never old. In every age God assumes a new name, in every age He does new work, and in every age He allows the creatures to see His new will and His new disposition. If people do not see the expression of God’s new disposition in the new age, would they not forever nail Him to the cross? And by doing so, would they not define God?”

from “The Vision of God’s Work (3)” in The Word Appears in the Flesh

“Some say that the name of God does not change, so why then did the name of Jehovah become Jesus? It was prophesied of the coming of the Messiah, so why then did a man by the name of Jesus come? Why did the name of God change? Was not such work carried out long ago? Cannot God this day do a new work? The work of yesterday can be altered, and the work of Jesus can follow on from that of Jehovah. Cannot then the work of Jesus be succeeded by another work? If the name of Jehovah can be changed to Jesus, then cannot the name of Jesus also be changed? This is not unusual, and people think so[a] only due to their simple-mindedness. God will always be God. Regardless of the changes to His work and His name, His disposition and wisdom remain forever unchanged. If you believe that God can only be called by the name of Jesus, then you know too little. Do you dare assert that Jesus is forever the name of God, that God will forever and always go by the name of Jesus, and that this will never change? Dare you assert with certainty it is the name of Jesus that concluded the Age of Law and also concludes the final age? Who can say that the grace of Jesus can conclude the age?”

from “How Can Man Who Has Defined God in His Conceptions Receive the Revelations of God?” in The Word Appears in the Flesh

Footnotes:

a. The original text reads “which is.”