Consciousness is an emergent property of information crunching in our brain. No brain, no consciousness, as you probably realize if you consider where your consciousness was before you acquired a brain at birth.
End of brain = game over. I would start getting used to the idea, instead of looking for totally implausible escapes whose only justification is wishful thinking and survival instinct.
And what you call atheist science, is only the logical conclusion rational people reach by analyzing the facts. Namely: we are what our brains compute. It is sufficient to assume a few glasses of not spiritual spirits (e.g. Vodka) to adios your metaphysical consciousness. It is sufficient to have a neuron destroying disease to kill anything that you would identify as a person. It is sufficient to have irreversible dementia or Alzheimer to have mothers not even recognizing their own sons or husbands that they loved so much before their synapses started playing crazy.
I mean, how much more evidence do you need? Do you really believe that a soul on earth with a kaputt brain will not recognize her own son or what she had for breakfast, while the same soul in Heaven will be hunky dory without any physical brain at all? That makes no sense whatsoever. That brain would not only be redundant, but counterproductive.
Therefore: No computation, no us. It looks very straightforward. Before birth = after death. Nice and symmetric. No evidence whatsoever of spiritual stuff of any kind that transcends that kilogram of disgusting looking blob that is in our skull. Any idea of a spiritual realm that will host our soul is also the result of naturalistic and physical mechanisms: namely our instinct to survive even beyond reproductive necessity. Our brains are the product of eons of naturalistic processes that optimized it for survival: it is not surprising that it misfires and makes up things when confronted with its own termination, or that shows "extended levels of awareness" on a scan