No argument on that point, but there is no discernable link between the science of biology and the philosophy of evolution, except for the belief system of some biologists. The term 'biology' has to be limited to that which may be observed, not that which can be imagined.
Only creationists and ID'ers refer to the "philosophy of evolution" or the "religion of evolution". I realize that's because some of the atheists will come out and say some of the oddest things.
However, evolution was observed in the fossil record. Everything done in biology since then, confirms the accuracy of the theory.
I'm not sure which part of evolution you consider not to be observed.