As Christians we have to understand how a covenant that has been made obsolete by faith in Christ
These words you have posted makes it obvious you really don't understand what you are saying.
Our faith in Christ did not make the law of Moses and that covenant obsolete.
God Himself made it obsolete.
13 In that He says, "A new covenant," He has made the first obsolete...
Yet all I hear you saying is it's everyone else who doesn't "understand".
Reminds of what Paul said...
desiring to be teachers of the law, understanding neither what they say nor the things which they affirm.
1 Timothy 1:7
JLB