You know what’s really hilarious?
The flood is recorded in the Koran.
We sent Noah (of old) unto his people, and he said: O my people! Serve Allah. Ye have no other Allah save Him. Lo! I fear for you the retribution of an Awful Day. The chieftains of his people said: Lo! we see thee surely in plain error. He said: O my people! There is no error in me, but I am a messenger from the Lord of the Worlds. I convey unto you the messages of my Lord and give good counsel unto you, and know from Allah that which ye know not. Marvel ye that there should come unto you a Reminder from your Lord by means of a man among you, that he may warn you, and that ye may keep from evil, and that haply ye may find mercy. But they denied him, so We saved him and those with him in the ship, and We drowned those who denied Our tokens. Lo! they were blind folk. [S. 7:59-64]
Recite unto them the story of Noah, when he told his people: O my people! If my sojourn (here) and my reminding you by Allah’s revelations are an offence unto you, in Allah have I put my trust, so decide upon your course of action you and your partners. Let not your course of action be in doubt for you. Then have at me, give me no respite. But if ye are averse I have asked of you no wage. My wage is the concern of Allah only, and I am commanded to be of those who surrender (unto Him). But they denied him, so We saved him and those with him in the ship, and made them viceroys (in the earth), while We drowned those who denied Our revelations. See then the nature of the consequence for those who had been warned. [S. 10:71-73]
I guess Mohammad ripped off the ancient Sumerians too.