[naniwaduni]

It's not a difference. Take a look at proposed mechanisms of fan death, and consider, does that seem like a belief in the supernatural? Or a belief in a natural process that, incidentally, shouldn't actually be true?

People generally believe their own beliefs, and this includes believing that the way they think the world works is natural, not supernatural.

[Bakary]

My bad. A supernatural force actually caused me to misread your previous comment.