Oakbrook Preparatory School is an independent Christian School. The school is not affiliated with any church or denomination. Teachers and administrators represent a variety of Christian beliefs. Those beliefs affect the way they treat children and the example they set for children. Chapel lessons, based on the Old and New Testaments, emphasize character development and service to mankind.

Oakbrook Preparatory School provides Biblical teaching. K4 -5th grades have chapel once a week and daily devotions. Grades 6th through 8th have chapel once a week, daily devotions, and a religious studies class; and high school students have a daily devotion, a weekly chapel and are required one unit of religious studies for graduation. It is our belief that students will best achieve their goals through a relationship with Jesus Christ. The desirable outcome of knowing Christ and knowing how to study is a life in which an individual uses his God-given talents and abilities to serve others.

Like its predecessors in England, Oakbrook has five basic rules of conduct that are inspired by Scriptural teachings: