I think they were always comfortable with the loss of truth... Historically, it has only been a matter of to what degree they take it.
I've met many who have no solid idea what their religion is about . They do not know it isn't true . They've been brain washed . I've even had religious people knock on my door , who don't know as much about their Bible as I do . The best reply I can give them is go home and read your Bible . Some will become deeper believers and the thinkers will feel embarrassed in the privacy of their own hoes .