Well I've slowly given up on belief in the bible but, one thing I said to my exfriend jw is - if it was God's organization he would have sent out a prophet to warn them to change their ways. I said this because she had admitted there were teachings that weren't right etc.
One of things that showed me that they weren't chosen by God in 1918-1919 was a thorough study of Daniel and Revelation against the WT's Daniels book of prophesies and Revelation the Grand Climax book. Not only did it show that they got it wrong, but that they knew it. They know they are not the "two witnesses" (at least those who had a hand in writing the two WT books)
I say that as background to my next answer. Being that they are no different than any other religion that claims they got it right, or country or government that claim that they are for people when they in fact just use and abuse them - you might say "Who will save mankind from other humans?"