This is the fundamental problem. The creationists trying to get evolution and science thrown out of the classroom in favor of teaching the Bible. Sure, nobody has disproven anything taught in the Bible...but there's no evidence of any of it being anything other than a book. I could write a book tomorrow about magical dragons and flying monkeys...you can't disprove anything in it, but that doesn't mean it's real.
Whether people want to believe it or not, there is a lot of evidence...a LOT of evidence supporting evolution and the big bang theory. Meanwhile, there is no real scientific evidence supporting the majority of the Bible. Matter of fact, again, there IS a lot of evidence that suggests the majority of the Bible is flat out fiction.
These people say "you can't prove it" or "it's just a theory", but then want their Bible taken as concrete fact just because it's the Bible.
The whole "You can't prove it" line is beyond sad. Just like in science, if you want your Bible taught in schools, it shouldn't have to be disproven, you should have to find real evidence supporting it. Just like evolution...
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.