Actually nothing to do with any religion. The two IMO can be and are different.

Many actually do believe in ghosts with no religious context.

Another example is spirituality in the tibetan monk sense which is separate from the hindu Yogi sense. Where body and mind are two different things.

Then there's the other pagan senses, which I won't go into! 🙃😈😁

There are far too many. Native American Indians have their own "spirituality" which is not a "religion" per say.