I know very little of T. David Gordon beyond his essays in “By Faith Alone: Answering the Challenges to the Doctrine of Justification” and “The Law is Not of Faith”. From these essays I gather that he is someone who speaks his mind, and perhaps bombastic (he carelessly compares John Murray to the drunk uncle no one wants to talk about). The main thrust of his essays is that Murray departed from the reformed tradition by not acknowledging great discontinuity between the Mosaic and New covenants. He makes several good points, but he tends not to realize that he is not arguing against Murray so much as the WCF tradition. I enjoyed his response to the oft-used argument that paedobaptists use: For God to say he will be God to someone necessarily implies a soteriological relationship.
Murray (and his followers) implicitly believe that the only relation God sustains to people is that of Redeemer (which, by my light, is not a relation but an office). I would argue, by contrast, that God was just as surely Israel’s God when He cursed the nation as when He blessed it. His pledge to be Israel’s God, via the terms of the Sinai administration, committed him to curse Israel for disobedience just as much as to bless her for obedience. In being Israel’s God, he sustained the relation of covenant suzerain to her; he did not bless or curse any other nation for its covenant fidelity or infidelity. In this sense, he was not the God of other nations as he was the God of Israel. (p 120 “By Faith Alone”)
Of course, such an admission undermines the paedobaptist claim that “I will be God to you and your offspring after you” (Gen 17:7) means “the promise of salvation is to your offspring.” Compare Gordon’s comments with Jonathan Edwards’.