So the "theory"of evolution is not very well known or is it just rejected?
Theory of Evolution is one of the most solid theories in science . It is well known and it is accepted from all of the scientific community. Endless number of scientist have tried to disprove it as part of the testing process but nobody has succeed in "rejecting it". It is proven by biology, geology, paleontology, chemistry, comparative anatomy, embryology , biogeography and more. It is so well established and known that if you throw half of the evidence it will still be one of the most coherent and verified theories.
Do religions just reject this "fact" or are religious folks just ignorant to it?
I wont speculate why they reject it. They are multiple reasons. Some do some don't. Some Christians do some don't. Christians who deny evolution are mostly the people who take the bible literally and reject all kind of science that contradicts the Bible (even hard proof). Those religious people I speculate are very likely a minority and are mainly in USA. The fundamentalists. I might be wrong about the statistics tho.
The "theory" (fact) of water being wet is pretty widely accepted. But this "fact" of evolution is not, why?
Evolution is accepted and it is rejected mainly by Muslims and fundamental Christians like protestants. I wont make any guesses about other religions. Ill leave the water being wet for someone else to answer.
When you talk about science, does that involve empiricism?
Yes. Science does involve empiricism?