The Christian god was mad because humans were sinful, while the gods of Uruk were mad because humans were too noisy. Both gods wanted to change humanity - the Christian god by flooding the Earth to wipe out sin, and the gods of Uruk by making humans quieter. The flood stories in Gilgamesh and Genesis both involve a man building a boat at god's command to survive a massive flood, but Genesis' flood rains for longer as punishment, showing the more punitive relationship between the Abrahamic God and humanity compared to the gods of Uruk and their followers.