I had this problem with my cat. I had to go to the options and enable the Gravity setting.

That's much too vulgar a display of power

Back in the days of witch burnings, church officials sometimes did accuse cats of devilry. In fact one bigwig did this huge cat purge right before the black death killed like 25 percent of the human population. Not coincidently spread by fleas on rats.

Young priest or old priest?

I don't see anything unusual here.

This is staged, they just built a sideways room and put a normal cat in it

Kitty's just doing wall rides. Let 'im shred.

Naw it's just doing cat things

Cats do not abide by the laws of nature.

Call the priest to show him cat pictures?

Why isn't this cat walking on the ceiling?