Superstitions are all materialism, because they are all based on the consciousness of body, body, body. No spirit there. Spirit has no superstitions - it is beyond the vain desires of the body.
Live contemplating the body. Contemplate internally and externally. Contemplate the origination of things in the body. Contemplate the dissolution of things in the body.
Ill-digested principles are, if anything, worse than ill-digested food, for the latter harms the body and there is cure for it, whereas the former ruins the soul and there is no cure for it.