I think you need to study your Bible, but I will be gracious enough to answer your questions. Adam and Eve were created innocent, but not righteous. I think if they had refused Satan’s temptation, they would have become righteous, and would have always refused his temptations. They ate the fruit, and immediately became sinners. If they had died that day, they would have gone to Hell. You may call that the second death if you like. It doesn’t really matter what it’s called. The animals were killed, to symbolize that blood 🩸 would have to be shed, so sins could be forgiven.
Of course, every single solitary human being (except Jesus) that has ever lived, is spiritually dead, and bound for Hell, UNTIL they become born again.
I believe Adam and Eve accepted the coats of skins from God, indicating to me, they accepted God’s forgiveness, but I think they sewed 🧵 leaves, to cover themselves. I think that was the first false religious act. They tried to cover their own sins, but they DID accept the skins.
I hope that helps you, but you need to study these issues.