btlc2 hours ago
All christian religions recognize each other as christians by teaching that Jesus is God, and by accepting The Holy Trinity. That's the main filter which JW, mormons, etc. can not pass, so they are not consider as "christians" by others.
Part of my reason for raising the question was because I think it is ludicrous to say JWs are not Christians because they do not accept the Trinity. A Christian is someone that follows Christianity, religion that is based on the life and teachings of Christ. Yet there is no consensus on those teachings, due to the large variance in possible interpretations of the Bible. The Trinity is one of those teachings, which was developed over a lengthy time frame, piecing together the vaguest of passages, and is not accepted by a large portion of Christians, such as Pentecostals that accept Modalism, or other Christians that adhere to Binitarianism.