Hello hepzibah and welcome to the board.
It may be a good idea to say that you wish to discuss Matther 24:14..(NWT)
" And this good news of the kingdom will be preached in all the inhabited earth for a witness to all the nations; and then the end will come."
Then ask them what "this good news" or gospel is according to the Bible. And then ask them what "this good news", or gospel is according to the Watchtower. Then ask them to read Galations 1:8 and 9 mean to them. Ask them if they believe Pauls two time warning.
Galations 1:8,9...
"8
However, even if we or an angel out of heaven were to declare to YOU as good news something beyond what we declared to YOU as good news, let him be accursed.
9 As we have said above, I also now say again, Whoever it is that is declaring to YOU as good news something beyond what YOU accepted, let him be accursed."
Then ask them if ANY of those scriptures state that it ok to preach as good news a message that goes not only beyond, but in addition to, what Christ and the apostles preached and accepted as " the good news"/gospel" to be preached.
Print this out and I'll continue tomorrow filling you in with what they will say to you, and what the Watchtower teaches as "the good news to be preached". Then you can ask them if they agree with what the WTS INC teach, or what the Bible teaches.
peace,
gwen
PS...don't know if I missed it but...when are JWs coming back to your door for the study on anything you choose?