text: Catholics believe that the Bible is divinely inspired to explain why.   Genesis recounts how God created man and woman to become one flesh in marriage so they can go forth and multiply.  Genesis also recounts how the human genetic pool was contaminated by original sin and further contaminated by the Nephalim before the Great Flood.  Who were the Nephalim?  The most popular view among bible scholars, who do not claim to be prophets, is the Fallen angels view: Satan or his fallen angels bred with human women and had offspring that were called Nephilim, some of whom were left to survive after the Flood to test man's faith in God.
  
  answersingenesis.org
  
  So no, God did not create "a whole gender type."  God does not make mistakes.  Fallen angels - or pure spiritual beings with free will - and human beings with free will conspired in sin which continues to manifest itself through genetic permutation.  The challenge as always for a Catholic is to love the sinner and hate the sin.