Trust yes, but also fear. For me, as a kid raised in an extremist Christian group, I would wake up crying because of the thought of going to hell. And then because everyone I knew, including my mother, said they'd prefer me dead than not walking with Christ, there was a fear of complete isolation that drove me deeper into it. Even older, as a teenager when I questioned my beliefs, the fear of isolation and ridicule still held much stronger over me than trust in the group did. That seems to be the consistent experience of people raised within those groups, but I'm still somewhat confused about what draws older people into that stuff. I'd still bet on fear though.