Jws are 1/10th Of 1% of the worlds population.
Name one thing that the Jws have done that a secular group could not have accomplished.
Believing with all your heart and soul that you are part of a gods one chosen religion can do wonders in getting people to work their hearts and souls for the leaders of the group so yes the are some large numbers in printing etc, but in reality, nothing supernatural about it at all. Its all in their minds, and obviously it seems to be enough.
A a side note: Is a Proverbs 4:18 considered a prophecy showing how in the last days the leaders of gods chosen religion has to continually change their teachings due to god giving these leaders incorrect information? And if so, what is the reason that god would not have given them the correct information the first time so that those, like us, that do research will read these false incorrect claims and decide that a god would not do this as it would cause people to doubt this group as having the truth.
If a teaching has been changed and the latest teaching is considered the "Present Truth" could you say that the prior beleif is a "past lie"?
Could you guarantee that there would not be any other changes to the doctrine? If not, then you are admitting that what is being taught now could be wrong. Could you be making life and death decisions based on this wrong information. Could you let yourself or a loved one die due to the no blood policy only to find out that the policy changed soon afterward?
NJY