Facts
The Creation/Evolution debate often gets stuck on the difference between a scientific fact, a theory, and a hypothesis.
Evolution is a scientific fact. That evolution is primarily driven by natural selection is a scientific theory with overwhelming evidence in support of it. Within evolutionary biology there are many specific hypotheses, such as "birds evolved from advanced small Theropod dinosaurs" (as opposed to "birds evolved from a separate lineage of Thecodonts"). These hypotheses can be debated and refuted without placing the fact of evolution of life on Earth in any doubt.
Why call evolution a scientific fact? Simply put, there are no other scientific explanations for the history of life in the fossil record, the shared genetic information in all Earth’s life forms, and the incomplete reproductive boundaries between many species.
Now, of course you can come up with a supernatural alternative to this fact. "God put those fossils there in such an order with apparent age to test our faith etc. etc..." But you must realize that there is a supernatural alternative to ANY "fact". Sure, God could create a young Earth and make it look old. Such a God could also create a flat Earth and make it look round. Invisible angels pulling at our feet could deceive us into believing in that unexplained force called ‘gravity’. Maybe the sky is really green but the sky-spirits magically prevent certain wavelengths from reaching our eyes or insturments. Frankly, some mystics believe that the entire world is an illusion. Science cannot disprove any of these ideas (I do not call them theories for this reason).
Actually, there are an INFINITE number of supernatural explanations for every so-called "fact". Maybe thunder is called by Zeus throwing lightning bolts around...maybe it is caused by Thor's hammer...maybe a giant transdimensional bird-spirit. And so on. There is no scientific way to say that one of these ideas is correct and all the others wrong.
Science is not materialistic because of ideology. It is materialistic because of necessity. The existence of entities or forces that can manipulate our senses would mean that there is no such thing as an absolute "fact", and science would be useless.
It has been argued that science requires faith. It does, in one area; it requires the assumption that there are no supernatural or extraterrestrial forces or entities manipulating our perception of the world. I believe this is a reasonable assumption, simply because we all must take this leap of faith just to live day-to-day without going insane.