The Jews believed that anyone calling on the name of YHWH would be saved. I won't bother to quote the zillion scriptures on that.
The early Christians believed that anyone who calls on the name of the Lord would be saved.
Paul in the first chapter of Hebrews applies a scripture that uses YHWH to Christ and says this is the lord who will save you.
Therefore...YHWH was "the Lord" or Christ to Paul. I've never heard any Witness in 34 years of studying it intensively ever address that scripture or explain it away.
In fact, although they scrupulously restore "Jehovah" to every place in the Hebrew Scriptures where it was replaced by "Lord" and also in the Greek Scriptures where the writers quote from the Hebrew scriptures, such as Paul does in Hebrews, chapter one....they omit it there...why? Why that one omission? Oh, and look in your large print Bible...it says in the footnotes that "adonai" was substituted there for "Jehovah" in the scripture Paul quotes.
Well, in the older large prints like the one I have it does. God knows what they have in there now...probably changed it like they have edited Watchtower volumes that have conflicting doctrine in them.
Rework the JW teachings from A to Z, and I might be interested again someday. Get rid of the unscriptural homophobia, the unChristian obsession with Jehovah and the rules and rituals of the Jews, the denial of heaven to All who put faith in Christ, the extraneous teachings about dates that come from superstition and pyramidology and 19th century Adventism, and the confusion about the nature of God and Christ, and forbidding of things not forbidden, the cover ups and scandals, the....well, too long a list to spend all night writing.
But then again, why should I bother? I've found something that makes me infinitely happier than being Witness for 34 years ever did.