To my creationist friends: Since God is all-powerful, it is certainly possible that God created the world in seven days less than 10,000 years ago. But he could also have created it last Thursday. That is, if the earth is less than 5 billion years old, etc., then God clearly rigged up the whole universe to look that old. Which He could have done. But science is about what the physical world looks like, and thus Creationism does not belong in public science classrooms.
On the other hand, I understand people getting upset when scientists cross a similar line in the other direction and claim that religion is incompatible with science. But that is what you should be fighting, not the scientific study of evolution.