To add to what BrassButtons said, Creationism deserves no serious consideration. Not because it presumes Christianity is true (seriously, the overwhelming majority of Creationists are Christians and the movement is intimately tied to Christianity), but because Creationists fail to provide any testable ideas. They can't provide them: they don't propose a mechanism. Creationism, boiled down, argues that someone, somewhere, somehow, made life. Until you can provide the who, the where, and the how, you do not, in any real sense, have a valid theory. All you have is mere speculation, and at best a lot of datapoints.
The argument that we need to examine Creationism is nothing more than a demand for special treatment. There are ample examples in Earth Science of an idea being discarded, properly, for not having sufficient supporting evidence or for failing to provide an adequate mechanism. In many cases, the discarded idea was later proven to be correct--but only AFTER the mechanism and evidence were provided. Until then, scientists CANNOT, in good conscience, accept the idea as true--there's not enough support.
There are rules to this game we call science. Creationism violates more or less all of them. They DO NOT present their ideas in peer-reviewed journals, they DO NOT present them in academic conferences, they DO NOT present them to people who actually understand the issues involved. Instead, they attempt to force their ideas onto children too young to understand the data presented to them, under the guise of fairness. They attempt to use the courts to force us to accept their ideas. They hijack religion (every theist who's not a Creationist should be deeply offended by what these people are doing in the name of their gods). In short, Creationism behaves like a social movement, not a scientific theory. And it should be treated as such: by keeping it out of science classrooms.