It is probably founded on mundane things, such as believing ones salvation depends on obeying a body of men or their interpretations and reinterpretations of prophecy.
I think that my parents accepted the 'truth' on the basis that 1914 ended the gentile times and that Christ invisible 2nd presence had begun. They accepted this on the evidence that the JW who called on them supplied. I don't think that my father believed his salvation depended on obeying a body of men. He believed they that there was a group of people who were chosen to be a faithful and discreet slave class and give out spiritual food at the proper time in line with the acceptance of the beliefs surrounding 1914 as fulfilment of Matthew 24:14.
I think if we can distinguish the different between believing in God and believing in religion
I think we can but not i'm not sure of it's value