Regarding atheists who don't believe in anything but are also terrified: I totally get that

My whole life people have been telling me that I'm going to hell. I believe that heaven and hell are a construction / fantasy of man, and there really isn't anything to suggest otherwise.

But when people keep insisting on a lie, after a while you might start to believe it. Even if you don't believe in it. If that makes sense at all.

I'm not sure what you'd call that either though. Technically I think it might jump the gap from atheism to agnosticism, but I'm no theologian.