More naming the problem from Susan Brooks Thistlethwaite, quoting Robert Bellah:
The extreme of this view [post-denominationalism], however, is that ultimately everyone’s faith is under their own hat. Could we have millions of faiths, each with only one member? The sociologist Robert Bellah described this phenomenon in the person “Sheila” “whose faith was so private and personal she called it ‘Sheilaism.’ In terms of our [Bellah et al.] categories of basic American values, she was an example of expressive individualism.”