Lol I remember I was in my own humanities course in high school, forgot which and yeh I believe we were debating and discussing atheism and theism as well. I chose to be an atheist, forgetting my buddy was a Muslim. My friend thought I was joking or volunteered just to be on the opposing side of things. A hijabi was the only one chasing after me asking why, I shut her up by winking and making her think I didn't really mean it. Thanks to that I escaped alot of unnecessary trouble... Though, I let that friend know after I got out of high school that I really meant it. For you since you have literally 70% of the school composed of muzzies, I suggest to keep pretending. They can get violent, if not now later. They can also totally make sure you will never be in their circles nor you with anyone else for that matter. Oh and they can definitely get your parents and relatives involved.