I think if you research hard enough, you will find that there is absolutely NOTHING exclusive about the WT Organization that some other religions don't already practice. You will find their doctrines in other churches no matter where you look. Each one of their doctrines that they think is so important, you will find another church that is teaching one of those doctrines. (The Jesus/Michael doctrine from the Adventists, and also the "soul sleep") As for their teaching that we are in the "last days" as well, you will find others that say the same thing. I call these churches "apocolyptic"; you will find some who will swear up and down that we are in the time of the end.
Just because they have this combination of peculiar doctrines that they teach doesn't in anyway make them any more "truthful" than those churches who teach another combination of doctrines.
Basically it does no good to argue with them or to show them scriptures because their minds are already made up. Their main problem is that they believe in their organization as their "savior" and not God as their savior. (So I believe this is basically "idolatry") They have no personal relationship with Christ. Everything is "organizational"; they even believe that the Bible is an "organizational" book and cannot be understood or interpreted by ANYONE except their leaders.
My advice to you is just try to keep the channels of communication open.
Cynthia