I'm convinced that when you die, you're gone forever. If I'm wrong, that'd be fine with me, but I see no evidence for it. For an individual's existence to go on after the death of the body, he or she would have to 'really' exist in some other 'plane of existence' than our physical world, and a connection between the two worlds would have to exist. There would have to be some specific entity -- a disembodied 'soul', if you will, that was the person's 'real self'. Again I see no real evidence for this.
Various animals less conscious than humans exist. Chimps share many traits in common with humans, although those associated with the brain are significantly less well developed. Would chimps, then, have 'souls'? How about bears? How about alligators? How about goldfish? How about dragonflies? There's obviously a continuum of creatures. Where and how would one draw a line?
The existence of conscious entities might be likened to a candle flame. When the flame is burning, heat from the flame melts the wax, which travels up the wick and upon reaching the base of flame vaporizes and is quickly oxidized and contributes further to the flame, which dissipates into the air. It's a self-sustaining process. The key is the word process. When the process ceases, the flame goes out. It no longer exists, even though the atoms that contributed to the process once were part of the candle, and now are part of the atmosphere. It's the same with life and consciousness. Both are processes. The living entity extracts energy from the environment, which in turn sustains the entity. When the processes cease, the entity that is a result of the processes no longer exists, even though the atoms that contribute to it once were part of other objects and processes, and have now become part of new objects and processes.
AlanF