The need to isolate oneself from other points of view suggests insecurity about the validity of your beliefs. I can understand why parents of young children would want to be very clear about religion and morality, so that the kids won't be confused about the basics of right and wrong. But we are talking about college students, young adults. If their elders think they would be endangered by arguments and ideas that don't fall within Christian fundamentalist doctrine, do those elders really have any confidence that their faith is true enough to withstand questioning?