For humans, a moral realist would say that while morality is closely related, it also can't be reduced to merely social cooperation. Sure, I'd buy that. But I

For humans, a moral realist would say that while morality is closely related, it also can't be reduced to merely social cooperation. Sure, I'd buy that. But I will also stand by my assertion that what you're calling "social cooperation" is sufficient for a workable morality to emerge. At no point is there a necessity for religion.