Genesis likes to say he's not superstitious.
He is, after all, a man of science as well as the arts. He only has logical superstitions or beliefs. The goddess is real, and if she teaches that chocobo feathers are sacred, they are sacred.
Genesis also has lucky socks, wishes on stars, and generally enjoys little beliefs, rituals, and superstitions, but if you ask him directly why he never goes round a church widdershins, he'll scoff and tell you you're imagining things.
Angeal usually smiles fondly when someone wears their lucky socks or avoids ladders; a lot of superstitions are built on common sense or the placebo effect and he's fine with that. But he performs rituals all the time to avoid issues.
Polishing his sword obsessively until 3am to avoid dishonoring his father's legacy. Tapping his locker twice because one time he didn't and several troopers died. Counting his toothbrush strokes to make sure Zack's teeth don't fall out because if Angeal doesn't set a good example, that's what will happen.
Zack is superstitious when he remembers to be, and takes a similar view to Angeal: it's common sense not to walk under a ladder! Common enough that he learned the hard way several times during growth spurts!
Sephiroth holds zero stock in superstitions. The only thing close to a ritual, belief, or supernatural observation he does is hold his mother's locket and wish for her.
Cloud is backwoods country boy folk tale superstitious because it's all real and he's definitely not seen it, but trust him, it's real. Stop asking questions. No, you did NOT see a deer in these woods, even if you did, and now that you said the word "deer", he's going to spit over your shoulder for you. And rip off that stupid patch you're wearing, it has an image of The Item on it and They will be attracted to it.
You don't want Their attention. Tie your shoes with the right bunny ear over the left. Bury your lost teeth on a moonless night with a sprig of spruce. Never go round ANYTHING spiritual widdershins.
