This is what my JW wife has been saying as of late when it seems like she has no way to defend the doctrines of 1914, blood, as well as their false predictions, etc.. I've seen on this board where others have encountered this come back as well. It seems that the witnesses are getting a little slack and it makes me wonder how they can justify their position of their religion being the only true religion.
First off, being the "closest thing to the truth" implies that the truth itself is known. Therefore, if the truth is known, why settle for being in a religion that is 'the closest thing to it?' Why not either find or start a religion that teaches the truth? Sounds like they're just settling for second best when they say that, but they rail against people of other faiths who decide to put up with errors in their own faith. This is, of course, assuming that these errors can be discovered and purged, which the witnesses claim they do. However, as you all know, some of their teachings have been proven demostrably false time and time again. If the Watchtower Society and its loyal Jehovah's Witnesses stubbornly cling to teachings that have been proven demonstrably false, why do they criticize people of other faiths who stubbornly cling to their false ideas?
However, lets assume for the sake of argument that they are correct in that their teachings are pretty close to the truth. Is it possible that another religion also has teachings that are equally as close to the truth? Assume, for the sake of argument, that there are 200 distinct teachings and of those 200 only 100 of them are correct. If a religion teaches all 100 of those correct teachings, it is teaching the truth. Since the Watchtower's teachings are 'the closest thing to the truth' according to some witnesses, perhaps they are teaching 100 teachings with 99 out of 100 correct and 1 incorrect. If another religion is also teaching 100 teachings with 99 out of 100 being correct but teach a different incorrect teaching than the one incorrect teaching presented by the Watchtower, then mathematically speaking both the Watchtower and this other religion are both equally close to the truth.
In my experience, I've seen pastors whose teaching very similarly to the Watchtower and I have seen where the Watchtower has changed some its teachings, replacing them with teachings that sound a lot like the teachings that come from the Catholic or Christendom's churches. Given the fact that the Catholic and Christendom's churches and the Watchtower changes their teachings every now and then, how can any of them claim to have the truth?