I think there may be room to interpret that line as not necessarily a belief in ghosts, but that whatever the base belief, it hasn’t changed much. They may not have believed much on the concept of ghosts, but keeping the door open to the idea, but as time went on, it faded a bit. They never really believed, but they did think about it a lot.

That could describe me. I don’t really believe in ghosts, but I also know that we don’t know much at all about the universe, so who really knows? However, throughout my life, I’ve thought about ghosts a lot, mostly because of books and movies, but it’s been a common subject of thought throughout my life. I probably believe less I’m them now, just like the chart. So while I don’t really believe in them, I’ve thought about them a lot, and that would put them in a similar place on my chart.

In fact my entire chart would look very much like this one.