I'm with R.C. and Mac. If the Gospel itself isn't enough then the culture is unreclaimable.
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.