Spiritually for me comes with no expectation of either eternal reward or punishment. I see it as available to us all in those moments when we stop and reflect and listen to that which is around us. If I'm in the midst of a peaceful, tranquil natural landscape then it touches me deeply. Those places where you cannot hear a car or the typical noise pollution. Beside a babbling stream, in the heart of an ancient forest, or atop a hillside on a clear day. In those moments I often feel a sense of the past rather than contemplate the future; I imagine how early humans lived in a world with none of its present day condiments. A tree with gnarled roots, the fleeting sight of a deer dashing between trees. Or alternatively, those moments in good company when people really connect, when they see and hear each other. And above all for me, when I encounter someone who really makes me think, or compels me to see the world slightly differently from how I saw it before. These things to me are deeply spiritual, and require no Gods or Goddesses. And then there's a glimpse through the Hubble, those astonishing images when we really can stare into deep time, when we see the light of ancient stars that probably expired countless ages before their immensity reached us. Or last thing at night when I go into our small garden and look into the night sky. I feel light in my stomach as a write this. And yes, spiritual. For me no Holy book could even come close to compelling me to feel such things. And I say this as a person who was traditionally religious for a great many years. I assert that I'm more spiritual now, more self aware, more beguiled by the universe than I've ever been.
My whole interaction with the cosmos is a relationship.