To see a long list of the different definitions of species look
here. BTW all the different breeds of dogs are actually
one species (Canis Vulgaris, I think), the idea of "breeds" is an entirely manmade concept that results from selective breeding programmes, something that very few human societies believe in (thankfully).
The point I've been (failing) to explain is the philosophical difference between science and religion, and where creationism fits in. To over simplify a complicated argument:
Religion: Certain sacred truths are known, either passed on from previous generations, or given to us by a higher a being. We attempt interpret the world around us with reference to these truths.
Science: There are no sacred truths. We look at the world around us and attempt to understand it without any previous knowledge (i.e. everything can be proven from first principles or tested by experimentation). Any idea that doesn't match the world we see is assumed to be false.
For me creationism is part of religion rather than science, creationist believe it a set of sacred ideas which are always true, whatever the experimental results. I think its a very bad idea to try to teach religion as science, and an equally bad idea to try to teach science as religion.
P.S. Don't get me wrong on religious education. Given the profound effect that religion has on our world I think its very important everyone has some religious classes, whatever their own beliefs (or lack thereof).