For the science bashers, this is called a hypothesis, not a guess.
The big difference is that a hypothesis will be tested against observed facts. Scientists do not have the luxury of saying everything they read in some old book is unquestionable truth, they have to winkle out every fact from actually looking at reality.
Usually the first hypothesis is wrong. Each turn of the crank gathers more data, and allows more accurate hypothesis to evolve to fit the real world data.
Translation: "We get to make it up as we go along and you don't. So Nyah."
Science bashers are unable to comprehend even such a simple sentence.