Hannah J Paul states,
"Just to restate things slightly for the purpose of clarification, the Watchtower Bible and Tract Society is a publishing entity; Jehovah’s Witnesses are not ‘members’ of the publishing entity. Jehovah's Witnesses are baptized Christians.
As to your question, let us ask the apostle Paul since he was directed by Holy Spirit to speak on the matter. His words are found at 1 Corinthians 1:10-13. He exhorts his fellow Christians, through the name of our Lord Jesus Christ that they should ALL speak in agreement; that there should be no divisions and that they should be fitly united in the same mind and in the same line of thought. Then he gives an example of where they fail to do same. So, speaking in the name of Jesus, the head of the Christian congregation, speaking under the direction of the Holy Spirit, and speaking words that are now recorded in God’s word the Bible, Paul makes it abundantly clear how important unity is. Given all that, I would say it is entirely possible for true Christians – who have come to conform their way of thinking to God’s way - to be unified as Paul mentions. Of course, if one takes issue with the written Word, that’s another subject entirely. Are you taking issue with the written word?"