Jehovah's Witnesses, why does the NWT use the words "Christ in union with YOU" in Colossians 1:27?

Stick with your king james bible! don't you know that the serpent,the devil has his own churches and universities that are changing GOD'S words to decieve the people?they say it is so we can understand it better but another lie! trust no man and study the word for yourself rightly dividing it.reread revelations1 and you will see only two churches are teaching the truth the rest are satan's sygnagogue