Perhaps the word you are looking for is compatibilism, the belief that free will and determinism are not dichotomies and are compatible ideas. I think for the time being it is pragmatically useful to believe in free will because for instance how could we prosecute a murderer if he was destined by the laws of physics to commit the crime? How could he be held responsible for something he had no control over?
I dont think "being human" is the cause of our inclination to substance dualism, the separation of the mind and body has more of a religious/spiritual agenda than anything.