And Solomon did evil in the sight of the LORD, and went not fully after the LORD, as did David his father. (1 Kings 11:6)
I have heard the lament of many good Christian parents who did all they knew to do to “bring [their children] up in the nurture and admonition of the Lord” (Ephesians 6:4) only to have them walk away from the faith as adults. This is nothing new, and the Bible offers examples from which we can take comfort.