You appear to be claiming a license to make things up.If we go only by what is said in the Bible, we can't really know what was the actual reason.
No, the reason their eyes were opened and they were suddenly able to tell right from wrong was, exactly as the snake said in the story, because they'd eaten the fruit of the tree of knowledge of good and evil.Bible tells what happened after they ate the fruit. But, the reason why their eyes were opened could be that then they just realized what they had done and felt naked.
Without the slightest evidence to support that belief.I believe the garden still exists.
Why should it exist, any more than Fairyland should exist?