From The Openness of God:

The other main difficulty about divine timelessness is that it is very hard to make clear logical sense of the doctrine. If God is truly timeless, so that temporal determinations of “before” and “after” do not apply to him, then how can God act in time, as the Scriptures say that he does?’ How can he know what is occurring on the changing earthly scene? How can he respond when his children turn to him in prayer and obedience? And above all, if God is timeless and incapable of change, how can God be born, grow up, live with and among people, suffer and die, as we believe he did as incarnated in Jesus? Whether there are good answers to these questions, whether the doctrine of divine timelessness is intelligible and logically coherent, and whether it can be reconciled with central Christian beliefs such as the incarnation remain matters of intense controversy.