For background, this is related to other questions about whether God may have changed in the past. It is often touted that God preceded all creation, and some even say that He is able to violate causality because in some ostensible sense He "is" causality itself and "created time". For those who believe that the Genesis account (or anything else) implies that God participated in essentially just one creation, and who use the nature of God as the Creator as proof that He always existed as an Omnipotent Being, does that not result in a contradiction? If not, why not?

If God suddenly decided to create one day (at the "beginning") but didn't before then, is that not proof that God changed? What was He doing for all eternity before He created anything? What caused Him to decide that, after an eternity of not creating anything, He would begin to be a Creator?