The need to believe?

[Silver]

To your key question, of course it's possible to be a spiritual atheist. You already are and you're not alone. As I'm sure you know, many existing religions are atheistic as are the non-denominational new-age spiritualists. For example Gaianists celebrate the world as a systemic entity and presuppose a single global consciousness but Gaia isn't a god.

I beg to differ.

In Greek mythology, Gaia (/ˈɡeɪ.ə/ or /ˈɡaɪ.ə/ from Ancient Greek Γαῖα, a poetical form of Γῆ Gē, "land" or "earth"[1]), also spelled Gaea, is the personification of the Earth[2] and one of the Greek primordial deities.

https://en.wikipedia.org/wiki/Gaia_(mythology)