Racism, like all  "isms", is a learned behavior.  They all stem from a world view that is dualistic: we/they.  Until we learn to get beyond the illusion of separateness, and experience the reality that we are all one, racism, jingoism, fascism - even feminism - will continue to divide and conquer us.  A huge change of consciousness is required to make any progress here.  I think a requirement for being a bishop should be 6 months in solitude leaning contemplative prayer.