One of the best arguments for evolution includes an argument against Intelligent Design. Assuming some entity was intelligent enough to not only design and fabricate humanity, and the world and the universe around us...then why were they dumb enough to get so many things wrong? Why, for example, do we have such short lives? And why do we have to spend a 1/3 of that time in a comatose state (i.e., sleeping)? Why do critical organs like the heart and liver not have any backups? Why do we have an appendix? Why are we unable to occupy 2/3's of our globe (that is, live in the ocean)? Why do we have to have such a messy excretory system, and such a clumsy (not to mention painful) reproductive system too? Why do we have such a powerful sexual nature...that we're prohibited by Commandment from indulging? Why are we susceptible to such a wide range of diseases and illnesses?
Face it...if Toyota or Ford designed a car with as many flaws in it as our bodies have, we'd say they were stupid. So were we created by a stupid Intelligent Designer...? The "hit and miss" happenstance of random evolution can account for most of the inefficiencies in our bodies much better.