The God Delusion gives a handful of arguments both for and against the existence of God. Your summary comes across as a straw-man, a misrepresentation that's supposed to convince us that the real argument is poor. Where did he make this before/after argument?

Intelligent design is just one hypothesis among many to explain the complexity (the apparent "design") of the universe. But it posits the existence of an even more complex entity. If we really need intelligent design to explain where eyeballs and bird wings came from, why don't we also need an explanation of the omnipotent designer?