Creationism in science classrooms (an argument for)

As Straggler already stated Science class is about showing you understand what's taught in science, regardless of whether or not you accept it. So if a student persistently answers questions which are some variant of 'god did it' in exams, the teacher has every right to give them a poor mark.But suppose the teacher did consider a students religious leanings and gives more favourable marks, what about the other 75% of students who do make the effort to study hard and understand the science as taught? Would they feel cheated, maybe not putting the same effort into learning the subject in future? After all it is just science, they are only learning 'theories' we don't know any f this for certain, and it could all have been different in the past anyway.
What if the religious student obtained a passing mark in science class because of this policy and based on this decide to take it in university. Should the university accept the student, given that they may need to reiterate basic highers or even standard grade level biology, holding back other students; or should they increase the minimum entrance requirements, which would have the side effect of making it harder for student with a genuine interest in science to get in?
I realise that these may be worst case scenarios, but it does suggest the more wide-reaching detrimental effects that could potentially occur.

Hmm... don't think I was making any oblique political arguments. More like I was suggesting a few more hypothetical scenarios, and maybe got a wee bit carried away. In retrospect, I probably should have addressed this post to ICANT, or not posted at all.Anyway, I get the gist of what you are suggesting in trying to get science to address alternative view points in such a way that the children don't feel they have to make a choice between science and their faith. But if you do this in science class, won't their beliefs just be highlighted as being wrong?

So based on your argument, if the genesis creation story is taught in school, the state position is that it is true? But then what happens to all those other religions whose creation stories are not taught? Does that make them false, leading to the establishment of a state religion, or would you have them all taught as 'true'?
Also you earlier suggested not teaching things which may contradict a religious teaching, the example given being a flat earth. Does that also go for two religions with conflicting views? Do you favour one religions views over another?At the end of the day, it's about teaching science. It's not about memorising a series of facts and blindly accepting them as truth. You are there to learn about the evidence available and how the conclusions are reached, and learn these skills so you can apply them yourself. However, this process is undermined when you are told to disregard evidence and the conclusions you make are contradicted by ad hoc assertions.