Hebrews 13:8 Jesus Christ the same yesterday, and to day, and for ever.
The verse above, among others, is often referenced to prove God's static nature. Frequently then, by extension, expositors want to insist that what God has done in the past He will do in the future and in the same way because of His constancy. Thus, we hear that Old Testament examples and requirements can be applied today. This is very much a common practice in promoting church doctrine.
As in much that guides Bible study, the assumptions associated with God's Immutability are suspect. There is no irrefutable evidence that God is so rigid that He cannot evolve and re-create as a part of His purpose. The constancy referred to in the Bible could easily be the constancy of steadily evolving purpose. There is no reason why God could not be constantly changing and thus His constancy is one of unending change.
Now, this speculation on my part is not meant to be conclusive but rather is intended to show that the ironclad understanding of the traditionalists is not as compelling as they might have us believe. If God never changes in the sense normally taught, how did He change His mind in the OT? How could Abraham debate with God over the fate of