I suggest you read up on the Sumer "myths" of Enki and Enlil. Enki made animals and man and has been equated to Satan. Enlil (made the earth and "Eden") dispised man and tried to exterminate him because they were too numerous and noisy - he has been equated to Jehovah. Yet Abrams, father Tarah worshiped Enki as had been the tradition of his forefathers, but when Abram reached his age to choose a god he chose Enlil or Jehovah. Hmmm, why would the jews pick a god who hated man? Enki in affect is the savor but in Christainty has equated him to Satan, yet the two are brothers. A rift came about when one brother was elevated to a higher position from their father An, which also coorelates to the Jewish texts of El Elyon. Which interestingly coincides with Greek,Roman, etc. mythology of Zeus/Jupiter/Uranus, etc.
To answer your question I believe that death was not always here, at least not from the outset, which is alluded to in Jewish and other ancient texts. It was when the "Gods" became angry that life spans were reduced as is seen with the Sumer legends of Enki and Enlil, and the Pantheon counsel that oversaw man. Energy does not become nothingness, assuming we all have souls, who is to say that the energy does not become of a higher order? Now I don't believe in "Heaven" or "Pardise", but what of other dimensions? Dimensions where everything coexists without the decaying prison known as the body...
The reason I suggest Sumer "myths" is that they are the oldest known culture on the planet - hmmm maybe there's more to believe there than a religion compiled some 6000 years plus after the fact. Also knowing that Abram -Abraham lived in Ur a Sumer city. So why is the Jewish version correct when it obviously is a spin off from Abram of Sumer texts which appear to be the actual originators? In fact the "tower of babel" in the Jewish language means "confusion" perhaps a parady? When the actual Sumer name means "Gates of the Gods". Hmmm why would the Jews make fun of an incident that appearently happened at that city? In Sumer legend Nimrod boasted of being an offspring of the gods -a (like Hercules, or other demigods) demigod and was smiten because of something he was trying to accomplish. Were the Jews poking fun at history because they entertained a rivel god? Was the building that Nimrod was building REALLY the reason for the "confusion" when he and his people could have went to a mountain in the area and been closer to the heavens than any man made zigguret? Appearently Nimrod was building over the legendary city of which Enki had once inhabited.
I find it interesting on how it becomes more convaluted the more you dig. The Bible is just one version (or word of mouth) of deeper occurances that happened in that local.
Ever wonder why the Book of Enoch, Sumer texts, Roman and Greek, etc. etc. have so many similarties such as 12 Titans, demigods, etc.? Makes you wonder.