"Most Christians believe that God abolished or replaced this covenant roughly 2000 years ago"
In Europe maybe. I wouldn't say that's the predeominant view among Christians worldwide. That view has no biblical support. There were no statute of limitations on the Abrahamic covenant!
I wouldn't argue the point contentiously. I think you would find if you spoke to the writer, and most evangelical Christians, you would find that their understanding is that they share the same faith as biblically-oriented jews, but understand Jesus to be the Messiah, as did Rabbi Kaduri (
ref)
There is a lot of old testament precedent for the non-legalist position, David eating the shewbread, "Circumcise therefore the foreskin of your heart", etc.
Rabbi Kaduri did not consider Jesus the messiah (as much as Christians would like to think otherwise). On his deathbed, he said that the messiah’s name would be Yehoshua (Joshua), which happens to be one of the most common Hebrew names on the planet. Jesus’ name was Yeshua, which is a very uncommon name.