We support evolution because it is a generally accepted scientific theory that explains the diversity of life on this planet. The reason it is so well accepted in the scientific community is because it is supported by a wide variety of evidence, including fossils, taxonomy, genetics and experimental biology results.
There are some Creationists who think that the evidence supporting evolution should be removed from science classes, or else their own myths about genesis should be taught side by side with them. We do not object to Judeo-Christian stories about origins being taught in the classroom. What we do object to is the stories being taught as if they were science. They aren't. Science is a process of making observations, testing evidence, and above all, finding and correcting mistakes. This is almost the exact opposite of what religions do. Religions rely on unalterable texts handed down from ancient teachers, which are not to be questioned regardless of what evidence comes up.
Evolution isn't "atheist science", however. Most scientists who accept evolution are not atheists. As biologist Richard Dawkins puts it, "Evolution doesn't make you an atheist, but it does make it possible to be an intellectually fulfilled atheist." This is because it takes most of the force out of the Argument from Design for God.
Evolution is a large, complicated academic subject. We highly recommend reading the talk.origins archive to learn more about this fascinating subject. It contains an overview of evolution, and extensive articles discussing most common creationist objections. Whenever somebody calls about evolution, if we do not know the answer right away, we will almost always look up the information at the talk origins site and have the answer the following week. Creationists would be wise to keep this in mind, and look up their own arguments on the site to be aware of the responses ahead of time.
Posted in: About atheism