That is NOT what Scripture says. LORD. Lord. Not the same.
and the Sion is called that d=same LORD numerous times in scripture. Try reading Romans 10:9-13 sometime and cross-reference it with the OT quotation from Joel 2:32.
Joel 2:32
32 "
And it will come about that whoever calls on the name of the Lord
Will be delivered;
For on Mount Zion and in Jerusalem
There will be those who escape,
As
the Lord has said,
Even among the survivors whom
the Lord calls.
Here we see Paul quote this OT passage about YHWH and apply it to Jesus who is the one and only Lord according to the N.T.
Rom 10:9-13
9 that if you confess with your mouth
Jesus as Lord, and believe in your heart that God raised Him from the dead,
you will be saved;
10 for with the heart a person believes, resulting in righteousness, and with the mouth he confesses, resulting in salvation.
11 For the Scripture says, "
WHOEVER BELIEVES IN HIM WILL NOT BE DISAPPOINTED."
12 For there is no distinction between Jew and Greek; for
the same Lord is Lord of all, abounding in riches for all who call on Him;
13 for "
WHOEVER WILL CALL ON THE NAME OF THE LORD WILL BE SAVED."
So a person must confess Jesus is YHWH(Lord) to be saved. Confess means to agree with so the person confessing Jesus is Lord is in agreement that He is YHWH. Whoever will call upon the name of the Lord ( YHWH) will be saved.
The above is exegesis 101 which you failed.
hope this helps !!!