But wait! What if science can deliver decision for this topic?

I mean:
Medieval times are there, uninformed in terms of modern age.

But modern times have given us a number of achievements:
Thermal imaging
Infrared imaging
Low-light image intensification
and to this topic: Ghost imaging by use of advanced radiology

And if ghosts exist as minds without bodies then certainly, substance dualism is proven as well.

So to "ghost-denialists": if you speak to a person who denies the existence of bacteria, then that is outrageous in these times, not so in medieval times.
Similarly too with ghosts! Answer: Time to update on the science!

Here we have a world where the best books can be printed by quantum data generation at the click of a button (artificial intelligence).
And the existence of God is given by radio-astronomy and advanced radiology, results given on pc-tablets.
So too, the ghost imaging!

Anything unclear?

The World is fantastic! Start believing, folks!