"Who said that humans were created naive or gullible? "
You pretty much answer that in your second paragraph when you wrote: "A rebel spirit made claims and accusations about the Creator and his motives to the woman and she believed him." Only someone very naive and gullible would take the word of someone they'd never met before over that of their creator.
And you know this for a fact, do you?
And of course this was all BEFORE they even had knowledge of good and evil. They didn't even know the concept of right and wrong, so how can you claim that they willingly sinned?
If this is what you think, then you have no idea what the tree of the knowledge of good and evil represented.
If you don't comprehend good and evil then you wouldn't have any concept of truth and deception. So God took a couple that had never been lied to and didn't even understand the concept of deception and put them in a garden with a lying deceptive snake. Is anyone surprised that such naive and gullible people were easily tricked? It's obvious to me that this would be the result, and I'm just a mere fallible mortal. Surely an all-knowing God wasn't surprised when the inevitable occurred.
Do you really want to know? If all you want to do is ridicule the Bible and its narrative, without understanding the reasons for anything, then obviously you have no need to ask questions if you don't really want the answers. Everything you just said tells me that you haven't got a clue what happened in Eden. You have already judged it all by your own interpretation, which is so far off base that it's actually quite funny.
Believe whatever you wish. It makes no difference to me.