Can we make an analogy between consciousness and a fire? A continuous pattern of energetic action with a constantly changing input stream of material? A fire must be continuous or the chain reaction stops, but it is not made of any particular stuff. If it goes out and you relight it, you are lighting a new fire. This is only tangentially related, but I've always found it interested that brain death occurs so quickly when oxygen is withheld. Here is a Quora post that explains some of the neurochemistry. It also doesn't bode well for cryonic freezing of the brain. I don't think I'm superstitious about my atoms per se, but the continuity of the electrochemical patterns that the atoms scaffold.