Efforts to connect people to God are frequently undermined by the lasting negative influences of absent, abusive, or negligent parents.
-Unchristian by David Kinnaman, p139
I see this all the time with youth, and adults for that matter. Divorce, an absent father that leaves a daughter seeking some man to "lead" her in life and give her comfort and support, uninvolved parents, apathetic parents...they all can be tough to recover from.
So, how do we break through this problem?
I'm guessing the best answer is a long, trust-building relationship. There aren't a lot of "quick fixes" in life. Through a relationship they can see what a true relationship with Christ is (assuming you are showing it) and that there is real TRUTH in life that goes along accordingly with the Scriptures. But, if you aren't following God's word and will with your own life than your actions are misrepresenting what it means to be a Christian because you have compromised your faith.
Compromising your faith is dangerous not only to the reputation of what it means to be a follower of Christ, but also to yourself because you may have chosen temporary pleasures of this world or directly disobeyed God's word because of some emotion sent from the enemy mentioned in the Bible here and here.
Thoughts on the effects of poor parenting? Compromisng our faith?
And if you'd like to see some stats on what happens if there isn't a father in the house (just one example of a bad parental situation) check out Kurt Johnston's post (Saddleback jr. high pastor) of collected stats here. A few of them are "5 times more likely to commit suicide, 20 times more likely to end up in prison."