[I]f someone tells you that they “don’t believe in” thermal conduction, it’s likely that they’re not so much saying they deny its existence as that they don’t understand what you mean when you say “thermal conduction.” For all their supposed disbelief, after all, they still avoid sitting on metal park benches in the winter.
Use of “belief” is a standard equivocation tactic. Any poll that asks about belief in a theory is fatally flawed, but then, I think most polls are a sham, anyway.