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My understanding is that Einstein believed in some form of afterlife because he accepted that the human body contained energy, energy cannot be destroyed, hence that energy must continue in some form after the death of the mortal body.
I hope I am not misrepresenting him as I claim this by memory only - and mine is certainly fallible.

Although this energy can be explained biologically as phosphate molecules moving down the electron transport chain and attaching to oxygen molecules as a final receptor, energy alone does not explain the entire complexity of the human biological system of thinking and problem solving - it requires energy to do these things, but no one in science today can totally explain the function of the brain and the cognitive powers of the human mind.
It is my belief that this transformation of energy into a useful cognitive final product is the godliness of mankind - or if you prefer the god image in which man was created. I think; therefore I am; similar to god.
And in that hypothesis, everyone on the planet, regardless of place of origin, is part of god, has a bit of god within them - and god would not condone himself to an everlasting furnace, so after death this god-part of man is reunited with the whole of god.
It may be wrong, but I find it more consistent with the extremely powerful spiritual teachings of AA and Al-anon, that to find god you look inside yourself because he was there all the time - the only thing that keeps you seperated is ego, or the self.