Humans are very good at creating a sense of the "other." In doing so, they can naturally and unconsciously create solidarity with their own group (i.e. kin, clan, tribe, cult, etc.) thereby increasing their odds of survival and passing on their genes to off-spring.
This sense of the "other" creates an illusion that your own in-group's beliefs, traditions, and norms are legitimate while those of out-groups are illegitimate. When a group gets too big, sub-cultures develop and the extremes of these are either re-assimilated or marginalized. The marginalized sub-cultures become cultures unto themselves creating new out-groups.
When it comes to superstitions, those superstitious beliefs of the in-group are considered legitimate and never as "superstition," while the superstitious beliefs of out-groups are more easily looked down upon as "superstition," heresy, apostasy, quaint, myth, etc.
A good example is in another thread in this forum where a member of a Christian cult states "transubstantiation is a Catholic belief. Not a Christian one. I'm a Christian..."
This cult member has full belief that his own superstitions are legitimate while those of other cults, even ones that are Christian, are myth, allegory, or otherwise illegitimate. Indeed, this cult follower is so deluded by his own cult's dogma and doctrine, that he refuses to accept Catholicism, the very base cult of all Christianity, as Christian!
Such ignorance and denial is common when comparing and contrasting religious cults and base superstitions, however, there are many base/core myths and superstitions that are shared between religious cults and other in-groups. The belief that Jesus was born of a virgin (a scientific improbability in the Iron Age, to say the very least) is one such myth. The belief that silent or oral utterances are heard by a deity who is loving and caring and will answer or respond (another scientific improbability) is one such superstition.
In short, the believers in religious cults are deluded by the doctrines and dogma for which they create elaborate psychological barriers and "spells" which legitimize their own myths and superstitions whilst minimizing and rejecting competing or contrary myths and superstitions of other cults.