We enter in the same state before birth.
But everything that ever existed is carved in the very fabric of spacetime.
It's possible (in the future) to a high advanced civilization to be able to scan the spacetime (possibly through a kind of quantum entanglement) and bring back the configuration (like a high definition 3D model) of everything including brains (in subatomic detail) and whatever.
If your entire body is scanned moments before your death it could be possible to create a perfect "clone" of you. The clone will be no different of you and will be no conscious in being a clone.
It's just like consider you're a different person after a general anesthesia or a deep dreamless sleep.
In the first person experience will be no time between your death and your "ressurrection". So it will appear as life after death.
The irony of this is that's scientifically possible unless we have an immortal soul. This conclusion is based on a materialistic view of the mind (like a software in hardware).