Isn't it a fascinating thought that atoms leave and then re-enter organisms?Thus reincarnation . . .?

Haha, nice thought. See, you are correct, but that is not the definition of "Reincarnation". That is simply the displacement of atoms-concentration gradient. By definition in religion, reincarnation exists within the "soul" which is immaterial. Atoms are material, and thus, the displacement of atoms aren't considered "reincarnation". Good thought though.