I also believe, as a Bible believing Christian, that abortion is sin and that God created us in his own image. I believe that children born with so called retarded "genetic defects" are less loved by God and should be less loved by their parents.  Many disabilities or disorders frequently targeted by eugenicists are also of an uncertain genetic nature to start with which also renders many eugenic practices valid in my view. Mental disorders like schizophrenia for instance, while there is an aspect of heritability, are associated with known genes. The causes of mental disorders dont appear to be extremely complex. There are environmental, developmental, psychological and, yes, genetic factors.  Sterilizing someone for a disorder that might not even be genetic in origin causes necessary pain and suffering on people.