Argument from poor design
The Dysteleological argument, or argument from poor design, is an argument against the existence of God - specifically a creator God. (Dysteleogology meaning unintelligent.)
"Something is wrong here. War, disease, death, destruction, hunger, filth, poverty, torture, crime, corruption, and the Ice Capades. Something is definitely wrong. This is not good work. If this is the best God can do, I am not impressed. Results like these do not belong on the résumé of a Supreme Being. This is the kind of shit you'd expect from an office temp with a bad attitude. And just between you and me, in any decently-run universe, this guy would've been out on his all-powerful ass a long time ago."
- — George Carlin 
The argument typically goes as follows:
- An omnipotent, omniscient and omnibenevolent God would create organisms with an optimal design.
- Organisms, especially humans, have features that are suboptimal.
- Therefore, God either did not create these organisms or is not omnipotent, omniscient and omnibenevolent.
Some of the suboptimal features often touted includes:
- The eye (including the human eye, as the retina is backwards -- among other imperfections).
- The Laryngeal nerve (seen most spectacularly in the giraffe with a multiple metre detour to reach a displacement of mere centimetres).
Speaking of the traditional conception of God, Stendhal wrote: 
- "The only excuse for God is that He does not exist."
Biblical God agrees it was a mistake
Genesis 6:5-6 states:
- "Then the Lord saw that the wickedness of man was great in the earth, and that every intent of the thoughts of his heart was only evil continually. And the Lord was sorry that He had made man on the earth, and He was grieved in His heart."
Emotional expression and admission of error also incompatible with God's supposed inerrancy and unchanging nature.