Hmm, I have a relatively decent level in maths, but nothing exceptional (some might say even quite low level if you think about all the branches involved). But I am really not a mathematician. There was an (half-serious, I would say) article, a couple of months ago, in the French Linux Magazine, stating that nobody needed math in CS. The "best" argument was that, even if you need complicated math for a given complicated task, some other people probably already wrote a package to do what you need. To me, this is appalling.

Yes, CS is definitely part of math (a small part of math, though). After all, remember that Dijkstra was a professor of applied mathematics at the University of Texas (Austin).