It is best, I think, to be open to the fantastic in our universe.  Contemporary physics is full of it.  There's also a healthy place for myth and imagination in one's life.

That being said, I think Freud's reference to occultism as a black mud tide is on target.  It boils down to the question being presented, and whether it has been clearly thought out.  Things like extra terrestial life, other dimensions, etc. are worthy in my view.

People who go on about alien abductions, past lives and astral projection are as dysfunctional as any evangelical.  There may indeed be overlap:  note some evangelicals' obsession with things like possession and rapture. 

(For some time I've suspected that devil worship is the other side of the fundamentalist coin--e.g., cattle mutilation occuring in rural areas, where there are many evangelicals.  Christian fundamentalists I've been around frequently seem to be in a Jekyll-Hyde dynamic.)

One philosophical aside:  it's good to remember that perception is never passive.  In part we experience what we want/need.  Do I think Hamlet really saw a ghost?  Yes.  Did he see one I could see?  No.

It's OK to pursue the fantastic as long as you're on the lookout for smoke & mirrors.