That we say God can change and you say God is immutable, but will not elaborate on how broadly your description applies. Clearly something changed during the incarnation, but you will not plainly describe how God's immutability is limited.
Change is ultimately for the better or for the worse. How can that which is absolute perfection, God, change as improvement and deterioration are both equally impossible?
I think you are confusing
movement of God with
change. The divine immutability should not be understood as implying immobility (the Unmoved Mover), as if there were no movement in God. It is even customary in theology to speak of God as
actus purus, a God who is always in action. See also Exodus 3:14; Psalm 102:26-28; Isaiah 41:4; 48:12; Malachi 3:6; Romans 1:23; Hebrews 1:11,12; James 1:17.
The Scripture teaches us that God enters into manifold relations with man and, as it were, lives their life with them. There is change round about God, change in the relations of men to Him, but there is no change in His Being, His attributes, His purpose, His motives of action, or His promises.
The purpose to create was eternal with Him, and there was no change in Him when this purpose was realized by a single eternal act of His will.
The incarnation brought no change in the Being or perfections of God, nor in His purpose, for it was His eternal good pleasure to send the Son of His love into the world.
And if Scripture speaks of His repenting, changing His intention, and altering His relation to sinners when they repent, we should remember that this is only an
anthropopathic way of speaking In reality the change is not in God, but in man and in man's relations to God.
It is important to maintain the immutability of God over against the Pelagian and Arminian doctrine that God is subject to change, not indeed in His Being, but in His knowledge and will, so that His decisions are to a great extent dependent on the actions of man; over against the pantheistic notion that God is an eternal becoming rather than an absolute Being, and that the unconscious Absolute is gradually developing into conscious personality in man; and over against the present tendency of some to speak of a finite, struggling, and gradually growing God.
The unsettled theist has God accreting knowledge at every moment. Per the unsettled theist, God therefore is more knowledgeable today than yesterday, and will be more knowledgeable tomorrow. Who is to say, then, that God in the future will learn so much that He will completely change on vital matters? To those that will say, no, God will remain true, how do they reconcile this with God's learning every moment? Why then is He learning anything if "no" is the answer? Well, the objector will state, that these new facts being learned are simply confirming God's perfect understanding. To which I would reply, being 99.9999 percent certain is not the same as being 100 percent certain. Only in the latter case do we find God
knowing. If less than that then God is
becoming, never ultimately
knowing. The alternative is God who is always revising His "decision tree of possibilities" to achieve His ends based upon new accreted knowledge gained as his autonomous moral agents act and He learns of these actions. Common sense dictates this is an unreasonable view of the God who
is.
AMR