How can an atheist teenager maintain his integrity in a religious school?

A few years ago, I read Ayn Rand's novel "Atlas Shrugged" for the first time. After a year of struggling between faith and reason, I chose reason. Unfortunately, I am a teenager, and I am forced to attend church and a religious school. For a time, I was fine coexisting with religious people. However, in the next academic year, I will have to take a class entitled "Christian Apologetics" in which I will have to pretend to be a Christian theologian. Now my integrity is at stake. How should I confront my religious family about my atheism? How can I persuade them to enroll me a different school?