Sin/evil cannot exist without "free will". If everything is pre-ordained then one cannot be responsilbe for ones actions.
"Facts are stubborn things; and whatever may be our wishes, our inclinations, or the dictates of our passion, they cannot alter the state of facts and evidence". John Adams
"A dishonest man can always be trusted to be dishonest". Captain Jack Sparrow
If everything is pre-ordained then one cannot be responsilbe for ones actions. 
