Well his point, and your apparent concurrence with it, is about as logically coherent as stating two plus two equal five.
Believing in "creationism" does not make one stupid, ignorant, or unintelligent. I am not aware of any tests, devised by man, like I.Q. tests, SATS, MCAT, LSATS, GRE, and so forth, conceived to measure human intelligence, which has the single question of, "Do you believe in creationism? Do you believe the Earth is only 6,000 years old? Do you believe dinosaurs roamed the earth 5,000 years ago?"
When and if the day comes the intelligence of a person can be ascertained on the basis of this single question, then he and you will have a great point. Fortunately, for the rest of the rational and logical thinking world, that day is not today.