"I worry about idols in my life, and it's killing me!"

Is everyone in the Book of Life originally? If so, when and why are they taken out? My good friend has a six-year-old diagnosed with an incurable brain tumor. How can I be an encouragement to her and her husband? I have a religious OCD, and I worry about overindulging in jazz, art, and audiobooks. Is that God warning me? What can I do to get free?