I don't think that you can be truly spiritual without being religious. It just doesn't work. A sociologist of religion named Nancy Ammerman has finished a new study of religion in everyday life. She concludes that the SBNR is a unicorn. By this she means that it is a species that does not exist in reality.
Congregants who only gave help to other members were twice as likely to fully trust their fellow worshipers as participants who neither gave nor received help. Members who only received help were nearly three times as likely to have the same high level of trust. But it was the combination of both that made the biggest difference.