The real test of a parenting model is how well equipped the children are to move into adulthood as vital members of the human race. Notice I didn't say "as vital members of the Christian community." We need to have kids that can be sent off to the most hostile universities, toil in the greediest work environments, and raise their families in the most hedonistic communities and yet not be the lease bit intimidated by their surroundings. Furthermore, they need to be engaged in the lives of people in their culture, gracefully representing Christ's love inside these desperate surroundings (9).
There are times when we need to shelter and protect our children, but if that is our primary to the world, then we are doing a disservice to our children. Instead, we need to teach and live out a biblical worldview. We teach them what it means to follow God and be a missionary in their world.