I'm having a lot of trouble figuring out what you're trying to say.
Mosaic law is about exclusion, about establishing who is God's people and who isn't through the ritualized creation of boundaries. Menstruating women are separate, sins are ritually cast out via scapegoat, customs associated with non-Yahweh tribes are prohibited and new customs like circumcision are created to distinguish Hebrews and Pagans, etc. etc.
Not quite, IMHO. I referred specifically to the ten commandments. While both protestants and many catholics refer to mosaic law as completely divine and thus immutable, I personally disagree with this. "Mosaic" law can be divided in two parts: The ten commandments, which is the core and most basic, generalistic part, supposedly dictated to Moses by God atop mount Sinai, and laws dictated by Moses himself either prior or after the ten commandments, that deal with far more specific cases and are the ones to actualy prescribe punishments to things, and are very much based around the jewish customs of the time, and aims to distance hebrews from pagan practices and customs by enforcing jewish customs while harshly punishing anything somewhat similar to pagan practices, and other things.
This last part is completely mutable and was only applicable at the time of Moses, and is incompatible to any different kind of society and culture. While Jesus talks of Moses in the new testament and says he received the law from God, he does not talk in specifics, which may mean he was referring to the ten commandments, which are divine in origin. Emphasis on "receive", meaning Moses did not create the law Jesus refers to, but rather received it from God. Jesus makes no references of other rules dictated by Moses. For example, while Moses prohibited his people from "summoning the dead" and "killing of a dangerous ox", Jesus says absolutely nothing of these things. These other laws were interpretations of the ten commandments and other elaborations Moses had to make to keep shit togheder in a big group that was formed out of several different other groups, in order to quell internal conflict and manage things more easily. In order to legitimize his power, he probably claimed these rulings were divine in origin as well, but thats just my interpretation of it.
Such laws make sense in the context of Moses, but not outside of it. For example, "summoning/communicating the dead" was something often done by pagans as means of fortune telling, something which Moses outlawed in order to keep his people away from pagan beliefs and customs that they were often being exposed to. Yet, communicating with the dead is something thats done by Jesus and the apostles, and in a way, is done even today in the catholic church, by praying to saints and asking for their intervention. Does this mean the catholic church, Jesus and the apostles are all in the wrong? Not really, since Moses' specific rulings are not applicable to them.