The greatest impediment to clear thinking by people who chose faith above all else is their unsubstantiated belief that the Bible is the inerrant word of God.
Believers well know about the feeling of certainty when it comes to their religious vision, they love to announce it but they cannot verify it. It is the cart before the horse.
Over the centuries, since Roman law mandated its own brand of worship through the religious organ of the Catholic Church, the idea had been established by universal reckoning... and punishment if denied... that the Bible always told the truth.
We, all of us here, would not be taking sides on this issue were it not for this grotesque distortion of reality courtesy of the Church of the Dark Ages.
Instead if we had taken evidence from the natural world, all would recognize the plain, coherent and evidential logic of Darwin's explanation of how life diversified from a common stock. One hundred and fifty seven years later after intense scrutiny by hundreds of thousands of scientists, no one has spotted a damning conflict in the theorum nor can they because it is factual. All subsequent major discoveries in the field have confirmed and further illuminated its truthfulness.
Not to believe this demonstrates a wilful ignorance of the facts of life as geology reveals.
To believe in creation demonstrates a person places a blind conviction in a spirit world and the thousand consequential and idiotic beliefs which follow from this primary error...none of which can be proved. The foundation of religious thought is whimsical, unprovable and therefore logically cannot be built further upon.
Humans are of course more than logical machines, we are far more... we are sentient; we feel for others and often want to be like them and be accepted by them. Perhaps unlike animals we greatly enjoy using emotion and imagination but what is the point of enjoying the emotional pay-back which comes from the certainty of belief in the unknowable... when contrary evidence within our grasp is testable like evolution is?
Surely we are observing a grave flaw in the human psyche?