Just today I saw another instance of the unchangeable God changing His mind.
I'm reading Ezekiel, and EZ 4:12-15 is an example of God changing His mind.
God can be "unchangeable", and still change His mind on occasion.
"And thou shalt eat it as barley cakes, and thou shalt bake it with dung that cometh out of man, in their sight.
And the LORD said, Even thus shall the children of Israel eat their defiled bread among the Gentiles, whither I will drive them.
Then said I, Ah Lord GOD! behold, my soul hath not been polluted: for from my youth up even till now have I not eaten of that which dieth of itself, or is torn in pieces; neither came there abominable flesh into my mouth.
Then he said unto me, Lo, I have given thee cow's dung for man's dung, and thou shalt prepare thy bread therewith." Ezek 4:12-15
What is God doing here other than testing the man? God knows His own laws as given to Moses. Consider this:
"And there came a voice to him, Rise, Peter; kill, and eat.
But Peter said, Not so, Lord; for I have never eaten any thing that is common or unclean.
And the voice spake unto him again the second time, What God hath cleansed, that call not thou common." Acts 10:13-15
God has never changed, but man has changed from the time of the first man Adam and continuing, usually for the worse. God has helped man to improve when man would accept His help. God never changed. And Jesus...?
"Jesus Christ the same yesterday, and to day, and for ever." Heb 13:8
Yet Jesus became a man and died and rose again. Were these not changes...or?