This may come as a surprise to you, but I actually see a lot more effort spent is spreading the word on mathematics than on spreading the word on evolution. Perhaps it is because I am a mathematician that I am aware of this effort.
What you see as spreading the word on evolution isn't that at all. What you are seeing are defensive measures. Evolution is under attack by creationists, and most of the attack is quite dishonest. Evolutionists are, of course, defending their science against the attack and against the dishonest characterization of evolution by creationists.
If all that were happening was that some students were avoiding the classes that teach evolution, and some parents were home-schooling their children (as a way of avoiding these classes), then you would not be seeing the activity that you consider "spreading the word". However, what we actually see are creationists trying to control the curriculum and attempting to insert religion into the science class.
Most scientists, and not just biologists, are offended by high handed and dishonest attempts of creationists to dictate that their thoroughly unscientific views be taught in the science class.