I have posted on the Origin of Sin previously, but found many incomplete and erroneous ideas to confound the issue. Here is Vincent Cheung's take on the subject, which I found to be quite good. A link to his blog, with many other of his articles, can be found in my list of links to the right.
"Although Christians have agonized over this so-called "problem of evil" for centuries, the argument is extremely easy to refute; it is one of the most stupid objections that I have ever seen, and even as a child I thought it was a foolish argument. Many people have trouble with the existence of evil not because it poses any logical challenge to Christianity, but because they are overwhelmed by the emotions that the topic generates, and these strong emotions effectively disable the minimal level of judgment and intelligence that they normally exhibit."
"...we come to the following conclusion. God controls everything that is and everything that happens. There is not one thing that happens that he has not actively decreed – not even a single thought in the mind of man. Since this is true, it follows that God has decreed the existence of evil, he has not merely permitted it, as if anything can originate and happen apart from his will and power. Since we have shown that no creature can make completely independent decisions, evil could never have started without God's active decree, and it cannot continue for one moment longer apart from God's will. God decreed evil ultimately for his own glory, although it is not necessary to know or to state this reason to defend Christianity from the problem of evil."
Read the rest here: