You probably will have to go, so you have two choices. You could bullshit through it, preserving your sanity and your rational way of thinking, just keeping it on the down-low. Or you could be a rebel and fuck the whole thing up, speak your mind and talk the preacher down or something, fail the class and then get punished.
I kind of like the second option because if you're intelligent and charismatic enough, you may get a chance to turn some people on to how you think and maybe you'll gain support. First option's mad safe though and will probably work out best in the eyes of your parents, but the con is you'll be a fake person to them. You'll be this facade of lies. It starts with the religion and all that, but it eventually gets to being that way with every little detail of how you think and what you feel and how you really act in your natural state, and then a few years have passed and suddenly you realize the people who love you most don't even know who you are.
I went through the same troubling scenario as a child and I was fortunate enough for my mom to have a midlife crisis and switch from extreme conservatism (seventh day adventism) to secular humanism during these past few years (as I have been attending college).
I harbor no hard feelings towards how she raised me because she is a completely different person now and I understand that she was trying to do her best while raising me (she's a true mother, she stayed at home just to take care and school me).
My fiance, on the other hand, has not had the same fortunate fate with her parents. They are still both conservative Mormons and I'm pretty sure they're going to stay that way.
I was scared I was going to be one of those horror stories where the free-thinker atheist is shunned by his family because of religion, but it turns out my mom was a free-thinker all along and just didn't realize it until half way into her adult life (due to being a preachers kid).
It's really fascinating to introspect your own life.
As to answer the question purposed in this thread, I shall answer it with another question.
Is being forced to kill all jews right?
No it isn't, the entire argument is based around authority.