Hummm... i got to tell you HAP. I don't like that link. The author is talking about absolute truths. For instance his gravity analogy. Sure there is a force called gravity that exists, and that is a fact but it is the mechanism that is important (and we still don't know how gravity works!!!). Nobody is disputing that there aren't variations and adaptations among living things, just as nobody ever disputed the existence of gravity. What is disputed is the mechanism of these adaptations, and as solid a theory as evolution is, it is far from fact. The thing is, that we don't need for it to be fact, we don't want it to be fact, because once it is seen as truth no advancements can be made. For example it was thought and even called "dogma" that DNA was transcribed to RNA and RNA was translated to protein always and in that order a "fact". Then retroviruses like HIV showed up and we now know that RNA can be translated into DNA.
The theory of evolution is fascinating, beautiful and powerful it can stand the test of time without being called a fact or a truth.