The Watchtower, like most Protestant Christian religions, believes in the Lutheran dogma of Solo Scriptura or "By Scripture Alone." They believe that the Bible is a complete record of all Godly teachings and beliefs. They believe you can come to a complete understanding of Judaic and Christian belief by reading the Bible. They believe you can use one part of the Bible to explain or bring understanding to another part of the Bible. Martin Luther was an Apostate on steroids.
I wonder how the Watchtower explains the origins of -
Israel making synagogues
Rabbis
Scribes
Sadducees
Pharisees
The Jewish belief in an afterlife as taught by Jehovah's Witnesses was not adopted until the Pharisees came on the scene. The Gospel accounts even record that the Sadducees did not believe in a resurrection.
So that makes for any interesting challenge to present to Jehovah's Witnesses - "Using only your Bible, show me the origins of Rabbis, Synagogues, Scribes, and Pharisees."