Hume argued against Intelligent Design in his 1748 essays "Dialogues Concerning Natural Religion" and "An Enquiry Concerning Human Understanding"
Hume's argument is essentially three-fold. First, Hume claims that in order for intelligent design to be feasible, it must be true that order and purpose are observed only when they result from design. In other words, nothing with order can be without purpose. We often see design in things like snowflakes, but this sort of design only is a very small percentage of our idea of order.
Secondly, our experience with objects is incomplete at best. We only recognize objects and purposes in our universe and realms of related experiences. What of other universes and others' purposes?
Third, if an ordered universe requires a designing god, then this god must have a mind. if "God" has a mind, who designed his mind? And who designed that designers mind? And so on, into infinity.