One of the problems we frequently encounter when discussing religion (especially in the context of science) is that a lot of people have a hazy understanding of what superstition is. They think superstition means “silly things other people believe,” and if we describe any of their beliefs as superstition, they think we’re merely insulting their beliefs without making any substantive criticism. This in turn allows them to get away with a lot of superstitious thinking, at least in their own estimation.
For that reason, I’m always on the lookout for a nice concise, comprehensive definition of what superstition actually is, so that we can share it with people and say, “This is why I describe your belief as a superstition.” So far, the definition I like best is this one:
Superstition is when you arbitrarily associate some particular effect with some particular cause in the absence of any plausible or verifiable, non-magical connection between them.