What's Holding You Back?

Let's pretend for a moment that you're God.  Your creation has a problem - sin.  And this problem is separating you from your creation.  How would you fix the problem?  How would you create a pathway to a right relationship between you and your creation?  Oh, and don't forget that your answer can't rob your creation of the gift of free will.  Whatever solution you come up with must be experienced individually, through choice.