God didn't create man with defects, that is because of the fall of Adam and Eve. One reason God allows people to be disabled or handicapped is that such conditions are the natural result of mankind’s rebellion against God. We live in a world of cause and effect, and it is a fallen world. Jesus said that “in this world you will have trouble” (John 16:33). This is not to say that every disability is the direct result of personal sin (Jesus countered that idea in John 9:1–3), but, generally speaking, the existence of handicaps and disabilities can be traced back to the existence of sin.