Well, I don't want to write your paper for you, and I suggest you really think about it yourself before writing anything at all, but here are a few suggestions taken from the main arguments I hear from the creationist folks.
1. Evolution is just a theory, so alternative theories should be taught alongside it.
Evolution is a valid scientific theory. Creationism is not a valid scientific theory. In fact, no alternative explanation rises to the level of scientific theory. This does not mean evolution is right, or that no alternative and valid theory exists, it just means that evolution is the best scientific theory we have to teach right now. The standards for this aren't arbitrary, they are based on several requirements that evolution meets, and creationism does not.
2. Not teaching creationism is anti-religion
Science class is not the place for religious beliefs. Most schools have comparitive religion courses of some kind. If not, that could be introduced. But science class is not the place to push religious views, especially one particular religious creation myth.
3. Intelligent design is different from creationism, it's a valid scientific theory backed up by scientific reasoning
Calling something by a different name does not make it something different. While it is true that ID has somewhat more reasoning behind it than creationism, it's still too much hand waving to be science. The concept of "some sort of intelligent beign designed life" is not supported by any evidence, other than rather specious reasoning that anything else doesn't make sense. However, the only theory that is attacked is evolution, and even if the attacks are scientificly valid, evolution being wrong would not make ID right. In science, you can't prove something merely by disproving something else, unless you manage to also prove that the two are mutally exclusive and one of them must be true. In other words, you can't put forward two competing theories, attack one, and claim the other must be true.