The fallacy of prejudice

Prejudice is based on differences.
It's also based on a perceived sense of superiority.
Differences allow for strength.
Any perceived sense of superiority is based on perspective.
From a survival  standpoint events dictate what is superior.  It has to do with color in some circumstances, but the color that works varies.  It has to do with intelligence, but sometimes it has to do with a lack of intelligence.  In many extinction events, the more intelligent species do not survive and the single cell organisms are left with the job of bringing life back from the brink.  All of us, of any religious color, have our presence thanks to some microbes that survived a catastrophe so the basic genetic makeup that defines us could survive.  Coincidence, starvation and disease defined our common ancestors and we cannot go back so far as to differentiate each other like the horse and donkey, so similar, but unable to breed more than one generation together.  We on the other hand, share traits as easily as we shed clothes.
The ancestors of the worst bigots in this country were like as not to have lovers of a different race, by choice or by force.
Religious differences are even less likely to have significance.  Except for the rare individuals who personally confides with the creator; the rest of us are left to our different faiths.  We readily and even happily kill each other because our gods are right; but if we really had the truth of it, our god would handle these things for us.  There is like as not one type of god or another, but my god defined by physics is as likely as yours defined by man and equally not plausible.
These logical perspectives will not change people of different races and religions from hating or killing one another, but in the final analysis these people are poisoned by thoughts of superiority which their teachers, like as not, did not earn.  Some in the far past may have laid down a course worth following, accepted death or dealt it out in such as way as to earn some modest acclaim.  But those who picked up the banner of their deaths or lives use those lifeless memories to condemn others for their own benefit.
Prejudice is prejudging, not using any common scale of fairness, but condemnation without consideration.  It is acceptance of superiority without justification.