Morality and belief in supernatural are mostly independent. (You can get Stage One morality from believing in God, but that's it.)
GP clearly thinks so to, which is why they presented the question, clearly trying to accuse GGP of a similar equivocation.
Your actual claim is ridiculous. It is most certainly not the case that believing in God can only connect to Stage One morality. Even in the face of a punishing god, this wouldn't be true, but not all gods are punishing anyway, making it even more off.
Another month, another rationality quotes thread. The rules are: