The new covenant, if you will please read it, it not in the future. You are misquoting scripture to say that, scripture is truth. I repeat Jeremiah 31:31 Behold, the days come, saith the Lord, that I will make a new covenant with the house of Israel, and with the house of Judah:
If you won't acknowledge the old covenant because it was to Israel, then to be consistent you must not acknowledge the new covenant or you decide you can write your own scripture to suit yourself.
We are subject to the new and old covenant as Paul tells us, the Lord sent Paul to be our apostle. But your idea of "Israel only" is false.