A new book by Theseus Research CEO Karl M. Fant wants to dispel the belief that it's important to be a good mathematician for being a good computer scientist. Though I don't share this opinion I'd recommend reading the discussion about this idea. Since math is the language of science you can't do computer science without. On the other hand, you don't have to do math in your daily work, when you're, say, an administrator and try to make things done. But that's no science in the literal meaning, of course.