Hi Debator,
Thank you for confirming your belief in the bible. Of course it is allowed to use other references, as long as they are not given MORE or SUPREME importance over the bible. Unfortunately the bible is not studied in the weekly meetings of JW, but rather the Watchtower, the kingdom ministry, or another book. Even if a multitude of references (usually it is less than a mere 10 bible verses) is read during one meeting, it does not take away that the subject of study is NOT the bible. It should be the other way around, the bible should be read A LOT MORE during the meetings, and the other publications like the watchtower A LOT LESS.
Just as all christian religions, the interpretation of certain verses has become more important than the message of Jesus, therefore the focus of the studies are on these interpretations, and everybody who rejects these interpretations is libeled an 'apostate', even if the bible is not specific about this point, or even worse, if it clearly contradicts this interpretation. As you must know, the biblical apostate is the one who rejects Jesus as Christ, the Jehovah's Witnesses apostate is the one who rejects the doctrines of the Governing Body, just to mention one such interpretation. Every religion has gone this road, and Jehovah's Witnesses as religion is no exception. Please take your bible and read the many accounts of preaching by Paul and Peter in the book of Acts, and you will see they never ever mentioned the hope of surviving Armaggeddon to live forerver on Paradise Earth. The live-forever-on-Paradise-earth message is one of many interpretations, clearly not a christian message. If you reply to this, please use alone the Christian Greek Scriptures.