Obviously, they come from homes where God is given His rightful place. Their parents are committed to the best in education for their children. So, on average, they do have some advantages. Yet, these advantages are not really given full play until these children are enrolled in a school which shares the values of the home . It is only after enrolling in the Christian school that many of these children in fact blossom, for they are no longer ridiculed by their teachers or peers for their faith.
Christian schools do discriminate on the basis of religious belief.
They must do this in order to create the kind of community between the home and school which will enable them to provide the strong values-based education which makes them successful. Public fine arts or technology schools also discriminate in the type of student they accept. The fact of the matter is that children in Christian schools are not much different at the time of enrollment than their public school counterparts. However, the earlier they are enrolled and the longer they stay, the greater the difference becomes.