That is what I think is the problem though. Whether people like it or not a large population of the country and world believe in religion. A person who believes in religion shouldn't have to listen to their teach tell them that their beliefs are wrong and that creationism doesn't exist as if it is a fact.
Conversely, a person who doesn't believe in God shouldn't have to listen to a teach talk about creationism and religion as if it is fact.
Discuss both and let the evidence speak for itself. If teachers wanted to present it in the fashion you do, so be it. If one has more supporting evidence, then let that speak for itself. Either way, neither has been discounted and proven untrue as of yet.
The government, school system, or what have you, should not get to decide what a person believes, if it isn't a proven fact or scientific law. To me, if it isn't a fact or law, then you should have to discuss the most popular theories on any subject as they are theories, and have not been proven or disproven.
For example, if there were two theories on gravity that had not been debunked, then both theories should be discussed as potential reasoning for why gravity exists.