I'll take any definition of "spiritual" that is the equivalent of "not all music has to be by Beethoven". I don't need to base anything I might consider spiritual on a god. My insula is not that insular.
At the age of five, Skagra decided emphatically that God did not exist. This revelation tends to make most people in the universe who have it react in one of two ways - with relief or with despair. Only Skagra responded to it by thinking, 'Wait a second. That means there's a situation vacant.'