So, what are these "spiritual aspects of humanity" then that don't involve dieties or supernatural agents?
Firstly, the willingness to offer CELEBRANTS to celebrate Births, deaths and marriages including chaplaincy services because there's no real need as someone as harshly aspiritual as yourself should understand.
By choosing to celebrate and mark these great moments in one's life one is accepting that there is something greater than human will, in the case of Humanism this is the great force of nature only realised at certain moments. This is what many would call human spirituality and British Humanists by having celebrants and chaplains recognised that another talented human is better than a mere protocol or questionnaire to mediate these moments.
So I move that although no God's or supernatural entity is invoked, spirituality is still celebrated.
The definition of spirituality as necessitating God's or supernatural entities comes from folks like yourself ....and we're not obliged to accept your definition.