The Wathtower admits that by reading the Bible alone without their help, people will believe in the trinity, hellfire, visible return of christ, heavenly hope for all christians etc etc.
Here's the quote:
"From time to time, there have arisen from among the ranks of Jehovah's people those, who, like the original Satan, have adopted an independent, faultfinding attitude... They say that it is sufficient to read the Bible exclusively, either alone or in small groups at home. But, strangely, through such 'Bible reading,' they have reverted right back to the apostate doctrines that commentaries by Christendom's clergy were teaching 100 years ago..." (Watchtower, Aug. 15, 1981, p. 29).
Why would people revert back to christendoms doctrines unless the Bible ACTUALLY teaches them!
William H. Conley