How are Dark Mtter and Consciousness different from Spirit?

[Angrboda]

I think the non-physical part is a hangup for many. But assuming that all things that exist must have a physical, or shall I say 'natural', existence is a presupposition. As an atheist, I don't believe in the existence of nonphysical entities like ghosts or angels or God, but my disbelief is based on an assumption that only physical things exist. It is an apriori assumption and is therefore merely axiomatic — it has no empirical support. It's just assumed.