(It's better than the Talmud.)
(Romans Chapter 10......all of it.)
Jesus established a new testament. He came to "fulfill the prophets", not to destroy the law. The Christian faith which Jesus established rightfully uses both testaments, but Jesus is the pure reelation of the Father, thus surplants the OT when there is a conflict.
Hebrews has the theme of the old covenant under the Levitical priesthood and how it has been done away with. It describes the Civil Code of Moses found in Deuteronomy 27. I don't think anyone would disagree with you, if that is your position.
Romans chapter 10 describes the same thing. See verse 5.
Christ is the end of "this" law (verse 4)
Christ is our new High Priest (Hebrews 8:1)
The old covenant has been done away with.....but I fail to see where the Feasts and Sabbaths instituted by GOD, not Moses, have been done away with. They were instituted for all generations (Leviticus Chapter 23)
I believe you are confusing these two things, trying to join them together. God also instituted the Ten Commandments and these are still in effect. This is the law that Jesus came not to abolish, but to fulfill. (Matthew 5:17)