there are so many things, but unfortunately most of them they will just brush off upon first glance. You cant be aggresive or argumentative. You have to be a thinker to get them thinking.
My thing lately has been "New Light". There has been a lot of it lately. But what is new light? What was wrong with the old light?
You could ask:
Q - "Did the Holy Spirit mislead the organization?"
A: "Of course not! Its like using a flashlight in a dark room, we are only given a little bit of light at a time so we are not blinded all at once"
Q - "Why would the Holy Spirit give wrong Light?"
A - "it isnt wrong, it is just refined"
Q - "how is changing the Generation teaching from those of 1914, to wicked people, then to the annointed a refinement? Isnt that a complete avant face?
A - "well sometimes we only understand prophecies as they are being fulfilled, so the FDS knows better as to what is happening now"
Q - "But Jehovah knows everything, and he doesnt lie. And if the FDS only understands prophecies after they are fulfilled then were they just guessing about these before? I mean, if the HS didnt lie to them, then how did they come to that conclusion?"
At this point they will get defensive and angry because they dont know how to answer you. The only answer is that it was human, fleshly reasoning - NOT LIGHT
You could continue that recent WT articles show that the FDS do not posses "special insights" and that the FDS "draws certain conclusions" about events. They have disconnected themselves from "inspiration" from Jehovah so they can avoid being labelled false prophets, yet they still credit themselves with "Light".
Problem is, "Light", or instruction from the apostles/prophets, is ALWAYS assoicated with HS - and of cousre the apostles were "filled with HS" according to scripture.
You are effectively undermining the only thing the GB hasnt given up yet - LIGHT. With LIGHT millions of JW's unquestionabley change their beliefs with the flip of a page. The GB knows better because Jehovah gives them LIGHT. Look, NEW LIGHT is in the bible!
If you like this line of reasoning check out my other thread http://www.jehovahs-witness.com/12/158294/2906453/post.ashx#2906453
There I quote scriptures and cite WT articles for reference.Let them be on the defense!!Remember, they are the ones defending a religion they dont question. Make them ask questions they havent thought of the answer to ahead of time!
Good luck!