According to the Bible, alienation from God is entirely due to the problem of sin. But what is sin, why should it be so offensive to God, and what is the biblical method of bringing about forgiveness and reconciliation with God?
Like someone in denial about an illness, we somehow shut out all thoughts of our relationship with God and of eternity. We cannot see why God would reject us. The Bible tells us how much we need to find Him, and how He has made it possible.