"So I can believe in the bible and God but if I’m not sure the FDs scripture really is the gb then I’m disfellowshipped?!"
Basically. This is the WT's mortal sin. Don't air any doubts about the GB in public or private, and you've got a decent chance of survival within that organisation.
Just quietly fade. Use the personal stress at home as your reason*. If you need to vent about the GB and your doubts, do it here.
*"Reason", not "excuse"; you don't need to justify yourself to these people.