I came across this video from a young black atheist who ponders why poor people believe in god and what the consequences are in believing in said god. He makes some very good points, all of which I have seen in my family of origin.
One of the major harms in believing in god is the mistrust is encourages in academia and in science. I admit that whenever I hear about a new discovery I will be skeptical until I either read more about it or experience it myself. Believers don't do this. They follow the "status quo" of their church or the others in their in-group. My first hand experience has been when talking to a member of my family of origin about the death penalty I was told that no matter what evidence I provided her mind was not going to change. The fact that she was adamantly unwilling to listen to another POV or reconsider a position taken by her church and community speaks volumes of the control that religion (belief in god) has over people.