I'm not much of an activist but I do think Creationism is dangerous. I tried to argue with them. They are not be argued with. If you mention some scientific method (say, carbon dating), they always say it's been proven to be false. Fossils? They laugh with scorn. The fact that you can not argue with them--or many of them--is what makes Creationists dangerous.
However, my real purpose is to learn something in an enjoyable way, and I have done that in the short time I've paid attention to this forum.