WT uses the same reasoning regarding "God's" name. But there are many other aspects regarding YHWH that they ignore, or actually they don't like to comment. Here are the basic facts that they ignore:
1.Jesus followers accepted to be named CHRISTIANS not Jehovah's Witnesses. By the way the name it was adopted in the Antioch Congreagation and not the "Governing Body" in Jerusalim, and the rest of the Christian Congregations accept it. What a huge difference between Booze Jo's changing name from Bible Students to JW's!!!
2.Jesus said to his desciples that "You will be my witnesses untill the end of times" He didn't said you will be the Witness of YHWH
3. The Father -Son - Holy Spirit, share the same name since Jesus told to His followers to Baptize in the Name of the Father -Son -Holy Spirit, and the name that the 3 persons share is YHWH
4. The Isralites had a Master-Slave relation with Jehovah that is why they were calling Him Jehovah, while Christians have a Father - Son relation that is why they are refering to Him as Father Jesus Lords Day prayer(in the Greek days we don't use the Latin, and for Sunday we call it Lords day -Kyriaki) begins with "Our Father". So a child respects the father by calling Him dad and not using the name
Regarding the New Testament or Greek Scriptures it was the Holy Apostolic Orthodox Church that set the Biblical Canon at the 4th century AD. Plus the Bible is NOT the only expression for God to humans. There are many other Early Christian writtings that they hold the Christian faith and are not included in the Biblical Canon. Indeed the Papal Church burned those who try to translate the Bible. On the contrary in the Romanae Empire(known to the West World as Byzantine)there was no dark ages. Science, arts, literature, and Christian faith never was persecuted. In fact it was kept for 2000 years and the Church never involved into Science matters like the Papal did with Galileo.
The following links show regarding the Bible and Christian faith
http://www.oodegr.com/english/ag_grafi/grafi1.htm Do Christians accept only the Bible
http://www.oodegr.com/english/ag_grafi/grafi3.htm Is the Bible the only source of Christian faith
http://www.oodegr.com/english/ag_grafi/genika/logos_theou1.htm Is the Bible the word of God
http://www.oodegr.com/english/ag_grafi/kritiki/protest_nootr1.htm Protestand misconcepts about the Bible
http://www.oodegr.com/english/ag_grafi/biblia.grafis1.htm Biblical Canon
http://www.oodegr.com/english/ag_grafi/kanonas0.htm The definition in the Holy Synodos of the Biblical Canon