Since Heaven and Hell are not temporal ..

[Brakeman]

Since Heaven and Hell are not temporal, and given the fact that we are a massively multicellular organism that refreshes its cellular make-up by cell die-off and replacement every 7 years or so, could it not be that the old cellular body that I once had as a christian will go to heaven, but the cellular body that I have now, as an atheist, will go to hell? Why would god punish the old dead me for the actions of the later current me?

You just want the best of both worlds.

I admit it, I do! I like to mess with theist's minds as they try to comprehend that we die every day, and over a long lifetime we gradually melt away through many bodies. The primitive goat herders that wrote the bible had no clue that we were multicellular, nor did they know of any of the micro-organisms that make our biological world work. Without the micro-organisms to aid in digestion and to keep harmful microbes at bay, every bit of upper life would be dead.
Yet Genesis doesn't mention the bulk of all life. How ignorant the story is!