This is perhaps the saddest current question on Yahoo Answers.
Even children among Jehovah's Witnesses know that nearly EVERY edition of the so-called "New" Testament includes four instances of "Jah" at Revelation 19:1-6 (compare Ps 68:4 KJV). Of course, "Jah" is the shortened form of the Divine Name "Jehovah". Some bibles refuse to translate these expressions correctly as "Praise Jah", leaving the untranslated "Hallelu-jah" or "Alleluiah" without its obvious connection to "Jah Jehovah".
...(Isaiah 12:2) Jah Jehovah is my strength and my might
...(Isaiah 26:4) Trust in Jehovah, you people, for all times, for in Jah Jehovah is the Rock of times indefinite.
There are many ancient manuscripts from the first and second century after Christ and the apostles which translate the "New" Testament into (for example) the Hebrew language, and these ancient manuscripts repeatedly use the Tetragrammaton (the Divine Name; "Jehovah" in English).
But suppose such evidence as the bible book of Revelation and these ancient Hebrew translations of the "New" Testament did not exist. Would that make it sinful to conscientiously restore the Divine Name where it seems quite obviously to belong? Would the questioner suggest that it is less sinful to remove the Divine Name SEVEN THOUSAND TIMES from the "Old" Testament rather than restore it some two hundred times to the "New" Testament?
Essentially, the New World Bible Translation Committee believed that it is preferable to err (if that is what they did) on the side of magnifying the divine name, rather than share in perpetuating a superstition that hides it. Incidentally, by 2007 there are at least twenty-seven other bible translations which also restore the Divine Name in the "New" Testament.
Witnesses love NWT largely because they believe that Jesus, the apostles, and the other Christian bible writers were like the prophets Isaiah and Moses (e.g. Ps 83:18) and other bible writers in that they must have used the divine name in their speech and in their writings. Sadly, the original Greek manuscripts of the Christian Greek Scriptures (the so-called "New" Testament) have never been found.
...(John 17:26) [Jesus said] I have made your name known to them and will make it known, in order that the love with which you loved me may be in them
...(Matthew 6:8,9) God your Father knows what things you are needing before ever you ask him. 9 “You must pray, then, this way: “‘Our Father in the heavens, let your name be sanctified.
Think about it: Jesus and his apostles must have been extraordinarily familiar with the Hebrew Scriptures (the "Old" Testament), and the evidence is that they frequently quoted from these writings. The Hebrew Scriptures use the divine name SEVEN THOUSAND TIMES; would Jesus and his apostles have skipped over "Yahweh" or "Jehovah" when it appeared in the text they were quoting?
Do anti-YHWH activists actually believe that the apostle Paul, a great scholar of Judaism and Hebrew, misquoted the Psalms with such a preposterous mismash of confusion as that which later corrupted Paul's writings...?
...(Acts 2:34, KJV) The LORD said unto my Lord...
[which plainly quotes]
...(Psalm 110:1) The utterance of Jehovah to my Lord is... [please note that ancient manuscripts ALL include the Tetragrammaton here in Psalms]
Look again at Psalm 110:1, and ignore how Paul (the Hebrew scholar) would certainly have quoted that verse.
Would JESUS CHRIST THE SON OF GOD have ignored Psalm 110:1's use of the Divine Name? Does it seem even remotely logical that the Hebrew-speaking Jesus, disputing with the Hebrew-speaking Jews, would misquote a verse of the Hebrew Scriptures in a manner which would obfuscate Jesus' very point about the word "lord"? For that matter, would the gnat-straining Pharisees have tolerated ANY misquotes by Jesus, who was the very bane of their hypocrisy? Compare Christendom's unclear supposed translation with the clarity of a translation restoring the Tetragrammaton (as Psalm 110:1 does).
...(Matthew 22:44, KJV) The LORD said unto my Lord...
...(Matthew 22:43, NWT) Jehovah said to my Lord...
Here are those verses again, in context, from Youngs Literal Translation. Note that the central point by Jesus revolves around the word "lord":
...(Psalm 110:1, YLT) The affirmation of Jehovah to my Lord: 'Sit at My right hand, Till I make thine enemies thy footstool.'
...(Matthew 22:41-45, YLT) And the Pharisees having been gathered together, Jesus did question them, saying, 'What do ye think concerning the Christ? of whom is he son?' They say to him, 'Of David.' [Jesus] saith to [the Pharisees], 'How then doth David in the Spirit call him lord, saying, The Lord said to my lord, Sit at my right hand, till I may make thine enemies thy footstool? If then David doth call him lord, how is he his son?'
...(Matthew 22:41-45, NWT) Now while the Pharisees were gathered together Jesus asked them: “What do you think about the Christ? Whose son is he?” They said to him: “David’s.” [Jesus] said to [the Pharisees]: “How, then, is it that David by inspiration calls him ‘Lord,’ saying, ‘Jehovah said to my Lord: “Sit at my right hand until I put your enemies beneath your feet”’? If, therefore, David calls him ‘Lord,’ how is he his son?”
As with Luke 4:16-21 (compare Isa 61:1,2), the New World Translation is quite careful to ONLY render the divine name when a verse or phrase in the Christian Greek (NT) Scriptures seems to quote or refer to a Hebrew (OT) Scripture with the divine Name. That is why the OT has almost 7000 occurrences of "Jehovah" while the NT has less than 300.
For centuries, most Jews have superstitiously refrained from pronouncing aloud any form of the divine Name. They base that superstition on the third of the Ten Commandments given to Moses:
...(Exodus 20:7) You must not take up the name of Jehovah your God in a worthless way
http://watchtower.co.uk/e/bible/ex/chapter_020.htm?bk=Ex;chp=20;vs=7;citation#bk7
What seems more surprising is that Christendom has largely joined with superstitious Jews in suppressing the use of "Yahweh" and "Jehovah". However, it seems that Christendom's anti-YHWH bias largely devolves from their hatred of Jehovah's Witnesses, the religion almost single-handedly responsible for the growing public recognition that the Almighty God of Judaism and Christianity actually does have a personal name.
Perhaps the questioner might ponder on whether it is preferable to be motivated by superstition and bigotry, or motivated by love of God (and His name).
Learn more:
http://watchtower.co.uk/e/na/index.htm?article=article_06.htm
http://watchtower.co.uk/e/20040122/
EDIT: The questioner has elsewhere clarified that she left Jehovah's Witnesses herself about 1991 because of her "own conscience".
https://answersrip.com/question/index?qid=20070706093057AA5RHqh&cp=2&tp=2&tnu=35#all-answers