What is "sheilaism"

Sheilaism is a shorthand term for an individual's system of religious belief which co-opts strands of multiple religions chosen by the individual usually without much theological consideration. The term derives from a woman named Sheila Larson, who is quoted by Robert Bellah and Richard Madsen in their book Habits of the Heart as following her own "little voice" in a faith she calls "Sheilaism".