I am with the government and others when it comes to criticising the teaching of creationism within schools in the UK.
Education Secretary Alan Johnson deserves praise for his robust criticism of schools who are teaching creationism, as does the national secular society. Read HERE for more details.
There is within the teaching of RE the possiblilty of teaching concepts about faith and that people used to turn to religion in the past to answer questions that were beyond their understanding. However, schools choosing to throw away Darwin's theories on evolution are doing children no favours at all.
Creationists often point out the there are flaws in Darwin's theories. However, Darwin has been proved correct in almost everything, yet creationists point to one thing that Darwin has got wrong and claim it proves their point. In the same way, creationists believe that all of modern science is wrong wrong. Creationists claim the earth is just a few thousand years old whereas geologists, using proven scientific dating methods will tell us it is many hundreds of millions of years old. Again, there is no proof in what creationists say. In the last ten years, DNA analysis techniques applied to many organisms have demonstrated the genetic relationship between all forms of known life (humans share 50% of their DNA with yeast, 96% with chimpanzees), yet creationists disagree with even these clear facts. Even if the theory of evolution was disproved, this would not imply separate human creation, which is the main feature of creationism.
So, perhaps there is a role for mentioning creationism as one opinion in RE, but it should be kept well away from the science lab. Creationsm is an unproven theory whereas science deals in provable facts that can be tested. Let's keep religion out of science.
P.S. Thanks to Iain Dale for being my proof reader floors/flaws no ammended. Cheers