I know this is not the place for textual criticism, and it is for the true meaning of "kosmos" in John 3:16. Speaking of "faithful" translations, what of 1 Timothy 3:16 (God was manifested in the flesh), and 1 John 5:7 (the Father, the Word and the Holy Spirit, and these Three are one)? where most "modren" versions have corrupted both places? NWT might not be a "tool" for the conversion of anyone for us humans, but there is no limits on what the Almighty can do.
I know of a missionary in India who was handing out Gospel tracts on a train. A staunch hindu took it and tore it and threw it out of the window. A small piece of this tract was picked up by a farmer boy, and all it said were the words, "I am the Bread of Life". These words made him ask his village leaders, of whom did they speak. They knew it was about Jesus, but simply told the boy to forget about it. He could not as a desire burned in him to know. In the next village he found some missionaries, who he asked the same question. They saw the opportunity to tell him about Jesus Christ, and he was saved! With God ALL things are POSSIBLE!