To understand WHY this is such a massive fail:
http://jwfacts.com/watchtower/jehovah-new-testament.php
And
http://www.tetragrammaton.org/harshrealities.html
Particularly this part:
A JW was arguing this:
http://jehovah.125mb.com/ (1) [italics added] Howard`s argument is simple: We find the Tetragrammaton in some form in all "LXX" fragments before the second century CE. In the manuscripts from the second century we find KS with a horizontal stroke above (nomina sacra). Thus the text has been changed. In the NT manuscripts from the second century we also find KS with a horizontal stroke. Such an abbreviation could not have been in the autographs, so the text of the NT has also been changed. Ana analogous with the case of the "LXX", the change in the NT was from the tetragrammaton to KS.
So essentially, To excuse themselves in adding "Jehovah" to the NT, the JW's say that the NT manuscripts are corrupt. How do they "know" that the NT manuscripts are corrupt? Because of the "Nomina Sacra", or the abreviations. The picture in the Bible Stories book SUPPOSEDLY shows Paul and a scribe writing his letters. This, the Nomina Sacra, are supposedly not started until the late 2nd Century, and the picture shows it being written like that IN THE ORIGINALS!!
MASSIVE FAIL!!! The artist who drew this probably has no clue of the implications of his drawing...
ILTTATT