

“I have no special regard for Satan; but I can at least claim that I have no prejudice against him. It may even be that I lean a little his way, on account of his not having a fair show. All religions issue bibles against him, and say the most injurious things about him, but we never hear his side.” - Mark Twain
You don’t have to look at Christians to think God isn’t so good.
In the Bible, Satan kills 10 people, Job’s children, and he did it with God’s blessing while they were having a bet.
God killed entire cities, all the firstborn of a nation even down to the slave’s children, killed everyone on earth except 8 people, killed a guy for picking up sticks, killed a guy for not allowing the ark of the covenant to fall, told the Hebrews to attack nations and kill every man woman and child in the land and was furious when they left a few alive, had a God-off to show he was more powerful and when the other side converted to believe in him he had them killed, killed David’s son and had his 10 wives publicly raped, killed 42 children for making fun of a bald guy… the list goes on, not to mention that God told the Hebrews to have slave’s, women were property and have to be killed if they ruin the one thing they were good for, their virginity.
Christians have weirdest relationship with the Bible. Many don’t really read it. If they did, they’d be Jewish. Jesus said to keep the Jewish laws, but Paul said it’s ok not to. Christians go with Paul instead of Jesus and generally disregard the Old Testament except the parts they think prove Jesus was the Messiah.

I agree in general but I can’t think of anything in the OT that is taken from The Epic of Gilgamesh except the Noah’s Ark story, which is a clear rip-off. And the 5000 years ago is too long, I think the oldest books are from the 8th century BCE.