That question have impressed me for a long time. If the Christian God were the True God, why His Churches are so divided, so that they can't convince millions of muslims to be converted to the christian faith???
If the true God were the Watchtower god, why does the Society's preaching is so limited???
If salvation were dependent on the Watchtower preaching, millions of men and women would be destroyed in Armaggedon without being preached.
Also, how many souls were disappointed by pedofile priests of the Catholic Church? (the same as in the Watchtowerland)
Accordingly, the christian religion is a historical failure. There is no such a thing as "salvation", because we don't need to be saved of nothing, unless you believe that we die on account of the original sin, which is a false doctrine of Paul's thought.