Several myths here:
1. The NWT is NOT the only bible to use yhwh in the NT.
Compare:
The Scriptures 1998
Messianic Israel Standerd Bible
American English Bible 2001
Although a valid point is that the name YHWH does not occur in any of the manuscripts we have. In fact Paul's letters first turn up in a gnostic religion called Marcionism which said YHWH was not Jesus father.
2. The NWT is the only bible I know to read Job 6:6 the way it does.
3. The insertation of 'other' in the NT from 1950 to 2006 had brackets and one could see it was not in the original text. (Removed in the RNWT 2013 and NWT 2006)
4. "At the end of 1st century there was apprx. 1 million of Christians spread across the whole Roman world."
FALSE!
Maybe a few Ebonites and Jewish Christians but certainly not a million. More like a few thousand,.
Tacitus mention is based on a bad historian he is quoting which is acknowledged by many today.