So this is where it becomes difficult to reconcile what you are saying to Bible verses that specifically say the Law is eternal and perfect and also binding for Jews. I'm not a Jew, but for Jews it appears it is binding. For non-Jewish people it gets a little easier to reconcile.The law as mediator came to an end with Jesus. The law WAS perfect. If it wasn't there would be no Jesus.
Jesus proved the law is perfect. But isn't law for sinners?