In a moment, Adam introduced death to his body. We are still in that moment.
Yah said "In that day you will surely die," and removed them from Eden so they would not have access to the tree of life. On that day their bodies began to slowly, but surely die.
We are in an era of existence in which death is necessary for life, but only because life is being reborn. Jesus is the firstborn of the new creation, and when we die we will be resurrected into that new creation. The new creation and old Eden are spaces where heaven and earth are intertwined, humans have access to the tree of life, and God is the source of all knowledge and wisdom, rather than our own ego defining what is right in our own eyes.
These few thousand years in between old Eden and the new one are just a blip...a moment of death. Billions of lifetimes, universes of entropy, existing in the waking dream of Adam's death.