I would like to point out that there are four things about this question that don't make any sense, and that there is a completely easy, rational, and non-offensive solution to this entire issue that can be found by simply returning to our constitution.
First and foremost, federally funded public schooling shouldn't even exist. This is the true answer to your question - Congress does not have the authority to be funding such an operation. If you disagree with me, read Article 1 Section 8 of the Constitution, and then read the Tenth Amendment; you will see that I am right.
Education is at worst a state's issue, and at best a private issue - i.e. private contracts with private schools. This way, if people are TRULY disgusted by the knowledge of Evolution, they can vote what education their children get with their dollars.
Second - Evolution has been observed, it has been used, it has been applied to other fields of study, and it has stood the tests of every scientific discovery since Darwin. It is on a firmer basis than the theory of atoms, the theory of relativity, and many other theories.
Third - Creationism isn't even a theory. The scientific method is based on observable studies, controlled tests, and peer review. Creationism fails all of these: it has never been seen, it has never been tested (because it can't be), and all claims by creationism are easily torn apart with proper knowledge of science.
The Theory of Evolution (don't be fooled by the term 'theory' - a theory is a fantastically proved thing. Atoms are a theory, electrons are a theory, the information used to operate a car is sipmly theory - thermodynamics-, gravity is a theory, the atomic bomb was developed by a theory... i could easily go on) HAS been tested, numerous times, it HAS been observed, numerous times (google 'observed instances of speciation'), and it has easily survived peer review.
Fourth - evolution and creationism occupy completely different fields. Evolution just says that life springs forth life. Creationism demands that life sprang forth from a God; one discusses how species come about, the other discusses how life originally is created. Evolution and Creationism aren't even really comparable. Creationism is more closely compared to Abiogenesis - the genesis of life from inate matter.
In conclusion, this question that gets asked day in and day out by just about every single person in the USA is a VERY misleading question that needs to be dealt with.