No, you will be perfect! The arts res is a lovely blend of arts majors (typically theatre and vocal/instrumental performance), other liberal arts majors, and science/engineer types. One of my friends came in as an engineer, switched to a physics major, and loved the arts res so much she was one of the coordinators (JF) this year, even though she hasn't done any sort of art since she got to campus (but she supports everyone else's!)
I think that the science majors appreciate the arts res in a different way, but it's almost more valuable for them. I'm majoring or minoring in theatre, so I get ridiculosity in my life on a regular basis because of that, and I know a lot of "artsy" people on campus. But for the people who spend all of their time taking physics or chemistry or whatnot, it's really nice to be able to come home to a place where math doesn't exist, if that makes sense. But there will be other science kids around to talk about homework with!
One of the distinguishing features of Bucknell is that everyone here has a lot of interests, and the school really tries to encourage that, which is why programs like the arts res are specifically not just limited to art majors. If you're interested in the arts, even if you don't plan to take life drawing or be in the next mainstage play or join an a capella group, but rather just soak in the atmosphere of an arts hall, then the arts res is a FABULOUS choice.
Sorry I wrote so much, I'm just very passionate if you couldn't tell.