Creation "science" is not really scientific in method, and therefore does not belong in a science classroom. Proponents of creationism bear false witness to both the Bible and science! Mainstream scientific explanations of evolution do not contradict with a firm and righteous belief in God or the Bible. Therefore, there is nothing wrong with teaching evolution in Sunday school. I think that would be a great thing!
For a good essay posted on the Web that deals with this topic, go to
http://www.theistic-evolution.com
It has the best arguments against creationism and ID I have read in a long time, and from a devout Christian!