>There's a character in it really similar to Adam, named "Enkidu", who is a wild god-man
Adam wasn't a god-man. Neither was he particularly wild, being a gardener. Gardens are symbolic of both nature and civilization existing in unity. Enkidu begins as a pure wildman archetype. These are different characters. At best you can say both are innocent but that alone seems like a slim basis of comparison.
>and was created from dust by the Sumerian earth goddess Aruru.
The Mesopotamians built their idols from clay. Gods creating humans from clay thus seems like an obvious trope that should be common in stories from that civilization.
>He is tempted by a harlot sent to him from Uruk by Gilgamesh and sleeps with her causing him to become weak.
She doesn't make him become weak. She tames him and shows him the way of civilization. Enkidu retains his strength but is won over to the side of Gilgamesh, which is civilization. Her sleeping with him is a reenactment of the goddess of civilization using her wiles to to steal the idea of civilization from some other god using sex, and giving it to humanity. The Mesopotamians associated prostitutes and transvestites with civilization because these things didn't exist before the first cities, and the idea of them were contained in the idea of civilization that that goddess stole for humans. Sorry my knowledge on this is rusty, but it's the foundation myth of Mesopotamian civilization. The prostitute sleeping with Enkidu is seen as a good thing. In Genesis, Adam isn't tempted by a prostitute, but by his own wife, and it's a bad thing that exiles Adam from both nature and civilization. It would be much easier to cotrast these stories than to compare them.
>There's also a very similar flood story and it's structure is almost exactly the same as the Bible's.
The structure isn't exactly the same. They're similar, but not the same. I wouldn't even say that they're very similar, just similar.
If you're going to compare both flood texts it would be much more conservative to assume that they are both based on a common source text or oral narrative that is now lost rather than Genesis being based directly on Gilgamesh. There's some obvious distance amd other influences at work there.
Calling Genesis a variant narrative of Gilgamesh would be extremely reductive. You'd have to ignore so much of what makes those texts different from one another that you'd be ignoring more than what they have in common.