The theory of evolution

My biology professor was lecturing about evolution today, the first thing he said was, "evolution without it nothing in biology makes sense." He went on to explain that every piece of biological data we now have supports evolution, without evolution it would be invalid. Then a student rose his hand and asked, "Isn't evolution just a theory?" My biology professor replied with something along the lines of everything we now know as fact is really just a theory, and went into to saying that no matter how much evidence science or history puts behind something, someone who refuses to believe it will not believe. He wasn't rude about it at all however he explained that there is a debate in the social world about evolution but in the scientific world there is not debate of weather or not evolution occurred anymore. He even went as far as to set up a lecture earlier this evening to talk more about the sociological debate of evolution. I really wish I was able to go, because I know it would have of been very interesting. This is the thing I love about college is how bluntly honest professors can be, I remember in junior high it being a big deal trying to teach evolution with out stepping on feelings.