Regarding #20 Not to sure which WT source you quoted from but I found a comment in the 4/15/01 watchtower page 17.
Writes historian Paul Johnson: "[Apostate] Christianity began in confusion, controversy and schism and so it continued. . . .
The source of this quote sites Christianity as a whole, apostolic Christianity,
Apostolic and apostate are two different words with two different meanings.
Apostolic - of or relating to the apostles, their times, doctrines, or teachings.
Apostate - desertion or renunciation of one's religion, cause, political party, or principles.