Why does He allow it? Or, seeing as how He knows the future, He did so from the beginning. Is it some kind of sadistic thing?
Mankind rejected God in the Garden, and brought this pain and death on us. Jesus salvation is the way out. We will never understand the reasons why it works like it does. at least not outside of Heaven. The point is getting there. Once this world is destroyed, it will never be brought to remembrance again.
NO! Adam and Eve rejected God. We should NOT be punished because they were stupid! God is wrong for doing so!
Seems to me you are rejecting God. Been in anybody elses heart and mind lately to find out if they are rejecting God? Or if they only seem like they are rejecting God.
From what I've understood we're paying for Adam and Eve's sins. And that's not cool.
How about if you were to be put in prison because someone you don't know, you've never met and is in another country did something you're not guilty of?
Actually, this doesn't seem to matter to you... that we might be paying for the sins of someone else. Why not? Because you reject the way out, which is to have faith in the salvation made by Jesus Christ.
Adam and Eve accepted Jesus (though they may not have known Him by that name). So, you show that you welcome sins worse than Adam and Eve committed, because you won't accept the only way out... Jesus. You are self-condemned.