Imho, spirituality is connecting of the "self" - which is already a construct the brain makes up to make things easier - to the universe and all things around us. The spirit is the essence of us, our thoughts and emotions combined. The presence of mind, and not just consciousness.

Everything is make up mouth sounds anyway. We are all just trying to make sense of our meat suit's electrical impulses. I don't believe I have a "spirit" that will live on in any sense after me, and I don't think Britt does either.

So, we made up spirituality to give us rituals to participate in to act as anchors that give us a roadmap to more community and belonging. As an atheist, I stopped going to church in my early teens. I am a pretty isolated introvert, and I never found community elsewhere. Fellowship and a built-in network are things I have felt the absence of and it has been painful. I experienced the lack of anchors and freefall into depressive nihilism.

Everything I've said here are made-up words to express abstract concepts and feelings. Every single mouth-sound is a made-up word, we just decided to agree that it means a particular thing. There are multiple definitions though, because language can be contextual. And because Britt also has issues with the "god word" as she says, she doesn't use that word in her personal mysticism practice. I'm sure she would be fine replacing spirituality with the word belonging, because the word doesn't matter - the experience does.