I "believe in science" in the sense that I believe that a rational, methodical, objective approach to studying the universe will bring greater understanding of how it works. But yeah, that doesn't mean that any given theory is true (edit: or that any given person is always right, because they're not). Even putting aside that sometimes people will be intentionally deceptive, there's also the fact that humans make mistakes, or even beyond that people make perfectly reasonable inferences based on available data without knowing that they're missing critical bits of info.