To identify as spiritual but not religious is, in contemporary culture, an extremely common and extremely contested position — dismissed by committed believers as vague and by committed secularists as wishful. What it often represents, taken seriously, is the refusal to purchase community at the price of assent to specific claims, combined with the genuine experience of dimensions of reality that purely materialist frameworks leave unaddressed. It is an identity in process, which is not the same as an incomplete one.
Each step builds on the last.