Personally, yes. Also if we are going to discuss evoluion vs. creationism we would have to accept the possibility of intelligent design and therefore the possibility of a creator. If we can not concede to this possibility then we can not debate between the two. Am I correct in this assumption? If not, then I apologize.
Talking in possibilities is useless, because almost everything is possible. It's best to discuss probabities, this way you're less likely to accept a false proposition.