Evolutionists say that Evolution is the Theory of how life has arisen on planet Earth. So many Christians say “See…Evolution is just a theory, not a fact.” But what most don’t understand is that the way scientists now DEFINE “theory” is that there are models to try to explain something, but there is only one “theory” which explains it the best. And especially in the case of Evolution, theories are thus often attributed the ranking of “Fact” since it is the most supported or “true” model.
So there are different definitions for the word “theory” – the technical scientific definition and the slang/loose definition.
See also this which is of interest: https://world.wng.org/2013/09/tactics_in_the_evolution_creation_battle