That quote is from the Law given to the Hebrews.
Jesus freed Christians from the law. Because we can’t follow it.
We could never be good enough.
So it doesn’t have to be followed by Christians.
I knew one Christian that thought it had to be followed, and I told him pretty much what you told me.
What I don’t understand is what this even MEANS in the Old Testament. (i.e. Why would God ask this of man?)