Win them over without a word. You are free to read and inadvertently leave reading material out in the open. Find old publications (best) or search Watchtower CD and book mark them and underline the nonsense with a bright highlighter. Especially the articles telling young people not to go to college (1969) because they will never be able to fullfil their career goals before the end.
There is enough stuff in the Watchtower publications to get anyone to doubt.
If anyone questions you they will have to confront their own publications. All you have to say is that you are doing research.
Eventually, you might keep a journal with your questions.
If your husband takes your material to the Elders he will have seriously breeched husband/wife confidentiality.
This is the same method they reccomend to women with unbelieving husbands.