Jesus' blood covers all those failures that would normally break things up. You may want to bring in some information on how to handle guilt at this point, as many young people don't feel forgiven. Of course not. The doctor is a realist - cancer is what is there. The doctor can't treat it, however, until the patient is willing to call it what it is.
Sin is spiritual cancer - it eats away and destroys.
God is simply trying to help us face the way it really is, not some fantasy that makes us feel better. Because he loves us, he won't let us live in a fairy-tale world of lame excuses, rationalization and avoiding the blame for our problems. God chooses to love us away from sin rather than scare us away. Well, tonight we've gotten right into a book of the Bible. It can be interesting and liberating.