I came across a useful pdf pamphlet from the US National Academy of Sciences today which sets out some of the issues around Evolution and Creationism.
It's a shortened version of a longer book that they have published. The book itself explains the fundamental methods of science and documents the overwhelming evidence in support of biological evolution. The book also evaluates the alternative perspectives of various kinds of creationism, including "intelligent design" and sets out the scientific and legal reasons for not teaching creationist ideas in public school science classes.
The pamphlet is a much shortened version of the book but gives an excellent short summary of the powerful case for Evolution as a set of facts and as an explanatory theory. It's well worth a read both by those who understand the theory and those creationists who either don't or who still have their fingers in their ears while shouting "la, la,la not listening..." National Academy of Sciences Evolution and Creationsm pamphlet
Update: I just came across this great quote from Albert Einstein;
"The further the spiritual evolution of mankind advances, the more certain it seems to me that the path to genuine religiosity does not lie through the fear of life, and the fear of death, and blind faith, but through striving after rational knowledge."