Go for it, religion has been a huge part of the human experience and like any other social study you should learn what ever you can. I'm an atheist but I've studied just about every form of religion in the world and throughout history, it has only strengthened my understanding of human nature and I'm much better for it. People often ask,"what is the truth?" by studying philosophy and theology you will find common threads of knowledge and they will help you find the answer. Do you/did you not enjoy mythology class? This is no different, hero's, villain's, monsters, fantasy realms, just look at it in this way and you may actually enjoy it.
Youre going to a private school so you pretty much have to obey their rules and pretty much every religion based school requires bibke/religion classes as well as attendance at chapel services. If they require religion as part of your grade then just deal with it. Its not going to kill you. Mature people deal with things they dont agree with all the time. I am Christian yet i have read the Quran and i have attended Catholic mass more than once - neither of which i agree with. Go to class and get the grade, think of it as a great intellectual experience. Youll have more accurate info for attacking God and religious people in the future. i mean, really, what are you afraid of?
I think that is a 'religions of the world' with a bit of philosophy thrown in. Take it and get what you can out of it, but don't offend people in the class who take it very seriously. All you need is a pass and a bit.
Well you do not need to BE religious to study religion. Why not take the class and learn about it? That does not mean that you need to believe in that particular theology. Many atheist were once religious, many were never religious, and many are very well versed in many theologies. Education is ALWAYS a good thing!
A agree with Caluvox (as I often do). Learn all you can about their version of Christianity. It could come in handy later in life when you find yourself debating against their beliefs. Be sure to ask all the tough questions. In fact, ask enough of them and maybe they will excuse you from your religious classes--but don't let them do that.