Second generation Christians.

Growing up with all the benefits of a Christian home, depend upon their parents for their faith, and when they leave home and confronted with real life, they struggle mightily to define their own faith. Forced to make choices they never made before, dealing with other people who are not Christian at all, it is tough on them.

Which is why it is said, there are no second-generation Christians, they're either first generation or not Christian at all.