I do not believe in the supernatural, magic, ghosts or anything like that. However, I can be very superstitious about tempting fate and won’t make jokes or flippant remarks that could be interpretted as such.
For example, my partner made a dark joke about how she’d rather have cancer than such and such. I begged her not to say such things, not because the thought of her having cancer upset me (although it did), but because it feels as if saying stuff like that could make it happen.
Same here. Don’t believe in ghosts, the supernatural, or any of that, but there have been very specific occasions where I’ve made utterances tempting fate and had that very thing happen, so now I try not to say those things or at the very least find some wood to knock on as if that’s going to do anything for me.