I think it's helpful to take the perspective that anarchy doesn't need to be "established," rather anarchy is the default setting sans rulers... a situation in which all coercive "establishments" are nullified. Another way of saying it, that coercive authority ought to be un-established... "legally" or otherwise.

Abraham's "rule" (or lack of) is as debatable as the texts which record his existence... probably not something that can be discussed among groups outside of judeo-christian tradition with any relevance.