Adam does make a decent point - natural law is natural, not theological. So the natural rights wouldn't be God-given.
"even the will of an omnipotent being cannot change or abrogate" natural law, which "would maintain its objective validity even if we should assume the impossible, that there is no God or that he does not care for human affairs." - Hugo Grotius
This is an important distinction because it serves to prevent human rights abuses against non-believers or primitive peoples. So natural law must derive from the natural world, and our natural state as human beings, not from God.
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