Good questions all. With regard to the last question ----
The King James Version of the New Testament was based upon a Greek text (the Textus Receptus) that was marred by mistakes, containing the accumulated errors of fourteen centuries of manuscript copying. It was essentially the Greek text of the New Testament as edited by Beza, 1589, who closely followed that published by Erasmus, 1516-1535, which was based upon a few medieval manuscripts. The earliest and best of the eight manuscripts which Erasmus consulted was from the tenth century, and yet he made the least use of it because it differed most from the commonly received text; Beza had access to two manuscripts of great value, dating from the fifth and sixth centuries, but he made very little use of them because they differed from the text published by Erasmus. We now possess many more ancient manuscripts (about 9000 compared to just 10) of the New Testament, and thanks to another 400 years of biblical scholarship, are far better equipped to seek to recover the original wording of the Greek text. Much as we might love the KJV and the majesty of it’s Jacobean English, modern translations are more accurate.