The OT is type and shadows of the reality that is Christ. Christ not only fulfilled the Law, He is also the fulfillment of Scripture. All Scripture points to Christ.
I'm sure you believe this, but I disagree. This line of argumentation is meaningless to me.
why was it ok for Noah to eat of any any animal after the flood, but only after the people of Israel were chosen and freed from Egypt did certain animals become unclean?
Because it was part of the way in which God set aside his Chosen People. It separated them from the customs of the pagan tribes surrounding them. It also serves as a form of spiritual discipline, and a reminder that even the basic activities, the most ordinary moments, of life, are sanctified.
So when Christ died on the Cross he made it possible for all men to have access to the Father and become members of the family of God. The door had been opened for all to join.
Not necessary. They were all already members of the family of God. Jews do not believe that gentiles have to convert to Judaism in order to be "saved". Non-Jews who obey the Noahide laws binding upon all men are known as "righteous gentiles".
The Jews are no longer the chosen people of [God].
Then God is a liar who has broken His covenant with Israel. If He broke the covenant with us, how can you be so sure He won't break the covenant with you?
So the command to Peter was not a breaking of the Law, but a fulfilling of it through Christ.
The fulfillment of the Law is in the observance of it, not in the rejection of it.