Biology textbooks reflect the belief that "The world is purely physical/material in nature" by not even entertaining the possibility that there could be a super natural cause for anything. Any natural activity is assumed to have a physical/material cause. This is philosophy, so it may not be physically written out that way in the biology textbooks, but everything in the textbooks points to this major world assumption.
Same with the issue of free will. Any act by a species is seen in a way that needs to be explained in chemical/biological/mechanical manner. There is no room for this mysterious/other-worldly notion called free will.
Same with the idea that there is no real purpose or meaning to the universe.
As for this statement:
If for example a person does not accept that all of existence is physical in nature, then he is more likely to question the 'evidence' of evolution.
It is not necessarily true because of specific theological beliefs only. Lets say a person has absolutely no theological beliefs from any religion, but he does not automatically assume that all of existences is physical/mechanical. That person, because of this world view by itself, now all of a sudden has a higher chance of rejecting evolution than someone who only believes in a physical/mechanical world view.
The real debate is on the level of philosophy, not science. That is because ones science is driven by his philosophical interpretations....whether he realizes it or not.
My point is that you can argue rationally about whether there is design in the universe, but you cannot argue whether the design is good or bad. The later is incoherent. Maybe the Grand Designer does want to make things confusing? Maybe he has put evidence of design in the universe, but not absolute evidence for whatever reason He wants? You can make the point that the design is good or bad, but that point has no real consequence to the question about whether there is design in the first place. Thats my point.
Another interesting point;
Do you agree that design does indeed exist anywhere in the universe? Lets say in the form of human design? If you do believe that humans actually do design, and it seems like you do because you are judging the design in nature based on human experience of design, then you have to come up with an explanation of how purely mechanical/physical beings produced this design to begin with?
Not quite what I am saying.
I do believe in the truth of empirically reproducible results. However, other than stating facts I do not see how these results force me to believe in anything. It is my belief system or personal philosophy that makes me conclude a interpretation of those facts.
Evolution is seen by many people through the lens of materialism/atheism. That means that while studying evolution these people ASSUME the world has no creator and and is purely physical and closed system, free from anything super-natural....and so on.
In that way, any discovery in biology is treated in this interpretation and millions of dollars of research money is used to search for evidence in that way.
Something as so fundamental to us as consciousness and free will is ignored as illusion because it doesnt fit into these peoples world view of a purely mechanical universe. Where did they get this idea that the universe is purely mechanical and material?? NOT from science, it is from their personal philosophy or belief system. Everything in science is interpreted towards that end.
Those who believe in intelligent design also have their assumptions, and will look at evolution in that way. They will tend to be looking for evidence of a super natural involvement in biology, and dedicate their research dollars in that direction.
For you to accept the intelligent design bias and not see your bias is amazing.
Science is neutral, it is your belief system that interpretes these 'facts'. The real argument is in the varying philosophies, not in the actual data of science.