text: Original sin is not my invention, it is the infallible teaching of the Catholic Church of which you claim to be a member. One doesn't need to have a literal interpretation of Genesis to understand the meaning behind it. Ask yourself, "could an absolute, perfect God have deliberately created such an imperfect world?" Absolutely not, for God and evil simply cannot abide each other.
  For obvious reasons God's creation was solely to glorify Him not, however, as automata but as individuals with free will who would freely choose to do so.
  The history of Creation, Original Sin and the Fall from grace is the only possible explanation for God's becoming man in order to redeem the human race. 
  We may ask why God chose to redeem fallen mankind but that is akin to asking why He created us in the first place: we know not the mind of God save that whatever He wills and brings into being is Good and He afforded us the opportunity to spoil it.