Hehe, I had a friend whos parents were jehovas witnesses. Their parents didn't want him to use special sounds on his digital keyboard, because they sounded like ghosts and this was considered evil.
I used to play D&D at a JW friend's house, but his parents were relatively progressive. We could play all day long and eat all the Cheetos we wanted, but we weren't allowed to summon demons. Everything else in the Player's Handbook was fair game, as long as we steered clear of demons.
I also encountered people who took their kid's Christmas present away for the same reason you mention. To be fair, you really could make some scary-ass demon noises with the Casio SK-1.
We went to the same church when we were young, where his parents sometimes had very specific problems with some video-games.
It was long time ago, but I remember them having problem with Age Of Empires, because "That is not how conversion works!" [1] :)
Playing Duke-Nukem was fine a.f.a.i.k.
[1] https://youtu.be/Bwd10I4oJjo?t=311