You are correct, elbib. Employed in the fashion employed by the Witnesses, the Scriptures are confusing.
The Witnesses, as you are likely aware, follow a popular principle that many of the other New Religious Movements of America's Secong Great Awakening adopted. Invented by the bishop-turned heretic Marcion of Sinope, they read the Bible as if it is God's ultimate, final, and exhaustive authority and form of revelation. This gnostic principle is opposite of Christinaity which in contrast views Jesus Christ as the basis for their religion, and the Scriptures as a product of this revelation.
Marcion taught that the Gnostics were correct that only a select minority was chosen by God to be saved from the evil world, but that the Gnostics were equally wrong in saying that no one else could gain salvation. The Gnostics claimed that "salvific knowledge" or "gnosis" was hidden in the holy writ of religions, and only the chosen minority could understand these secrets. Marcion believed the holy writ was limited to Paul's epistles and an edited form of Luke's Gospel, but that this select group could teach this "gnosis" to followers who would need to follow and hang on to every word of the chosen ones less they perish with this world.
Oddly, Marcion was reportedly "surprised" when he was excommunicated and stripped of his position for his teaching. But his ideas and followers never really died off. The Church Fathers eventually had to develop an official canon of liturgical and teaching texts in response to Marcion's challenge, but the idea kept rising up over the centuries.
The American era of the religious awakening revivals rejected traditional religious ideas, including those of the Reformation. Marcion's ideas became popular once again, with the Bible being used as if it was an exhaustive, all-encompassing revelation from God. The problem was that each new group saw themselves as "chosen" by God to bring the only truth that had been "hidden" in the holy writ of Judaism and Christianity...until their new "chosen" group appeared that is.
Read disconnected from the original relgious liturgy and traditions by which the texts were created, the Bible gives quite an incomplete picture. These groups took advantage of the resulting incomplete picture created by disconnecting them from traditional religion, claiming the traditions that shaped the text were all of human or evil origin, and that without following the select chosen leaders of these "Last Day restorationists," the hidden and saving knowledge of the Scriptures could never be discerned.