>In the story, Adam and Eve did not learn about good and evil until after they ate the fruit.

Did they though?

They knew that eating the fruit was wrong, so they clearly already understood the concept of good and evil, and they could be talked into disobeying God (arguably by appealing to their envy of God,) so they already had the ability to choose.

The sin wasn't the ability to choose to eat the fruit, or to comprehend the choice, because humans were already made in God's image as moral beings, but in making the choice itself. They "knew good and evil" because they already knew good, and then chose evil, in the same way you "know comfort and pain" by stabbing yourself in the arm with a knife. The knife doesn't grant you the ability to feel pain, that's just the consequence of your actions.

That's just my interpretation, and I'm not a believer. As a mythological narrative, it makes more sense to me that the forbidden fruit is a moral test. But I have no idea what the original authors intended.