Jehovah`s Witnesses claim to be Christians but have with no New Testament backing usurped Jesus with Jehovah.
There are two core doctrines the JWS tried to establish , one being that Jesus is not god which most Christian religions profess, the other is that they have actively made themselves apostate false prophets, preaching a tainted commercialized gospel of Jesus.
The JWS proclaimed that the established Christian faiths were practicing unrighteous inaccurate worship and praise to the son rather than to the father Jehovah (Yahweh)
This to them was taken as they are more righteous in the eyes of god and because of that will receive his blessings and the other Christian faiths will break down and be destroyed.