Long time lurker here, not much posting here, but as I'm from Holland I might shed some additional light here.
Creationism was to me taught as spontanous generation: an outdated theory. I realize Creationism can be taught differently in other schools, but the textbook I had treated it not seriously, and I never heard an outcry of Christians.
Just because it's in the law to teach Creationism doesn't mean it's treated very seriously. That's not to say Creationsim is non-existent in Holland (I've met a few of them personally, fellow students at a Biology University), but I don't consider it a pressure group.
The 'debate' the minister wanted seems to have changed to a general debate concerning the place of science in society. While I very well can imagine this debate can turn bad, it might also turn good.