I'm not suggesting (and I hope Roebuck isn't saying) that something is needed other than the Gospel. I read it as saying that a corporate, i.e. formal group response to the Gospel is required, at the family, business, and yes even government levels, in addition to our individual responses.
Think "Chick Fil A" or "Hobby Lobby". Not perfect examples, but a good start nonetheless.
From the original article: "But proclamation of the Gospel, although necessary, is not sufficient for cultural renewal." To renew the culture we must be able renew enough individual hearts. If the Gospel isn't sufficient for that then, can't get it done, then the culture cannot be renewed. You can pass all the declarations you want - it won't mean a bit. If the Gospel isn't sufficient then all is habel.