Must say I'm still baffled by this thread.
If Neuhaus' question, and SI's by proxy, is "can atheists believe in the words of the founders' DoI; i.e., 'natural law'?":
-- Hobbes argues that Natural Law comes from human reason;
-- Grotius argues that Natural Law applies even to atheists;
-- Spinoza argues that Nature and God are the same;
all of these interpretations predate the DoI by a century, and so were available to its authors;
where's the contradiction in atheists believing in Natural Law, if, for the sake of argument, that's what it takes to defend the DoI and be a "good citizen"?