Of course, but from my perspective you almost certainly do need spiritual nourishment of your own, given my broader concept of the spiritual. Purely a matter of perspective.
Which is all to say when someone like me says people can’t live without spirituality, it doesn’t necessarily imply that they feel everyone needs to believe in some kind of supernatural power.
I think it depends on how you frame ‘spirituality’. Love for example can never be meaningfully measured empirically, it’s a spiritual truth. You just know it. It cannot be reliably be proven or disproven, especially across different people.
I don’t think the line between ‘I truly believe in love’ and ‘I truly believe in god’ is as crisp as people would like to believe. That’s not at all to say they’re the same thing, but they’re more similar than a lot of people want to accept.
Spirituality itself, as with anything spiritual, is a know-it-when-you-see-it kind of thing. But that’s an unsatisfying answer.
I do think ‘the opposite of empirical’ is a decent shorthand. The less a truth can be objectively defined, and the less consistent the nature of a truth is across different people, the more spiritual it is.
Enjoyment of music and wonder in the face of nature / the cosmos are two more spiritual truths I think most people know.