Further to God's identity and his activity in creation.
The view that the Genesis account is impressionistic, and that creation 'really' happened otherwise either holds that God could not have created as the account sets out (or he was unable to communicate the connection between his word and its outcome), and that it must be as the materialists say; that is, despite the information in the account, God had to create something else to bring about the creation: a mediator in 'natural law' at best. A created mediator and a mediator of his will other than Christ!
But it goes further; this view disperses God's sovereignty into his creation, and into the domain of pagan speculation that de-personalises creation, putting us in a 'world' where God is not author proximately, but is distant, vague, and un-known-about.
