An atheist, is someone who does not believe in a god or gods. that’s it, that’s all it means. So, you can be an atheist and believe in the supernatural. Sure, most atheists will not believe in the paranormal, but it is perfectly possible to be an atheist and believe in spooky things.
If you are asking me for what i would call such a person, i would simply call them atheist. If you simply must have a term that describes an atheist who believes or maybe believes in the supernatural, i would go with “atheistic paranormal enthusiast” or something of that nature.
I have been an atheist for a very long time, and also have a fair bit of experience with religion and terms for what people believe. Here are some terms that may help you:
Atheist = Someone who does not believe in a god or gods.
Strong/Hard Atheist = Someone who believes there is no god or gods. (big difference)
Deist = Someone who believes there is a god, but does not follow any religion.
Theist = Someone who believes in god and also follows a religion.
There are many more terms, but those are the ones you will come across most i find.
As for the term “agnostic”. I Don’t really like that word. I have no problem with people who are agnostic or anything like that, I simply don’t like the actual word.
It is said, that an agnostic is someone who claims not to know if there is a god or not. But really, that is a meaningless definition to me. Gnosticism and belief are very seperate things. If we say an agnostic is someone who does not know either way, then everyone is an agnostic about more or less anything. If you take in to consideration, the possibility that reality is an illusion, that we are in some kind of matrix, then really, the only thing you do know for sure is that you exist, other than that, would would have to be agnostic about everything, even agnostic about if I gave you this answer or not.