Even most atheists still have a spirituality...
Do atheists bury their dead? Why? ... clearly there is something immaterial to be celebrated there, a spirit (?), when the dead are being cared for and respected in any way.
Yet I myself might be the most atheist person in any given room, I turned my back on religion after some of my family got killed, and that is a stone hard place of atheism to be in. Yet I have seen a sprite, I've seen it with eyes in flesh, I recall this memory daily, often, I'm lucky in the sense I've seen what many only ponder, so that means I may still be argued back into atheism because it requires no faith to see something material. It becomes an odd atheist argument to argue that at times, in odd situations, the spiritual becomes material. I have a bridge here, I'm the hardest core atheist you will meet yet I have knowledge of the spiritual, beyond just faith which is what Christians ask for.
Can a spirituality be based on knowledge and still validly call itself a spirituality?....