Final answer:
Antinomianism is a belief rejecting moral law due to faith and divine grace, potentially leading individuals to become slaves to their own impulses or a society without moral structure. It stands in contrast to ethical naturalism and can lead to moral chaos.
Step-by-step explanation:
Antinomianism is a theological doctrine that emphasizes the belief in the saving faith and divine grace to the extent that it rejects the need for obedience to moral law. It originates from the view that individuals are freed from the obligations of moral law by faith and divine grace. While not directly addressing the phrase "how is it another form of slavery?", antinomianism can become a form of ideological slavery when it leads individuals to moral complacency or anarchy, becoming slaves to their own impulses or the disorder of a society without moral structure.
Comparing antinomianism to ethical naturalism as expressed by Aquinas, one can argue that it opposes the natural order and objective values, thereby leading to moral chaos. It raises debates similar to those in incompatibilism, where free will and determinism are considered inconsistent, with antinomianism leaning towards an extreme version of free will without moral constraints.
The concept of freedom discussed within antinomianism is aligned with the notion of negative liberty, where the absence of constraints allows action; however, without guidance towards the good, as proposed by Aquinas, it risks creating anarchy or moral confusion. In this sense, antinomianism creates a dichotomy between a misguided sense of freedom and the inherent enslavement to undirected impulses.