Men are the problem, yes. But men also penned the books in the bible, as scribes and translators. Christ is the Word of God, though. I know its hard to think that we would have heard about him without the bible, but I believe we would have. Through people speaking of Him, and through the Spirit. I can't prove that, but as long as someone was listening, then I believe we would have heard God speaking through His Son, in spirit.
Remember, Paul learned nothing through the bible, or even through the other apostles and disciples. (nothing he agreed with anyway) And yet, he learned about Christ from Christ, himself.
You won't get an argument from near anyone here about the WT books not being authoritative revelation, though. People here tend to know that already, or at least are on their way to discovering it.
Tammy