I think some Chinese (I don't want to extend it to "Eastern" because I don't know) ways of thinking are "superstitious" from any rational standpoint. Even in non-religious contexts, it's common to believe in things like being careful not to accidentally invite a ghost to stay at your house during ghost month. Or take something like blood types, a Western medical discovery. Many people In Taiwan and Japan believe blood types can say something about your temperament or use it for match making.