Rachel, on a campus like ASU, I'm pretty sure there will be Bible studies. However, there's also a chapter of
Hillel. It seems pretty big, so I'm sure that you won't be isolated religiously.
As far as Bible studies in chapter are concerned, I highly doubt that they will be the center of the organization, or that you will feel pressured to attend. Look at this as an opportunity to broaden horizons, both yours and your future sisters', by attending their religious events and inviting them to yours.
Lunarwolf, it's too bad that your sisters took such a narrow-minded approach to things. I mean, cursing their hairspray? That's just ridiculous!
I really don't think that you need to "come out" to your sisters about your personal spirituality, but since it seems like you're interested in sharing that part of yourself with them, maybe you might just leave your books and cards out once in a while. College is a time for people to search and question, and certainly they cannot fault you for exploring "alternate" paths.