Maybe you and many others are simplifying this notion of ‘life’ after death. Sure the ideas of the compilatiors of ancient scripture, whether Christian, Vedic, Buddhist, Hindu, Zoroastrian, Pythagorean - or any other ancient philosophical creed that suggests the possibility of an afterlife, can not produce alchemical ‘gold’ after transmutation through your unforgiving crucible of of scientific empiricism.
But let’s consider the metaphysical perspective in all this.
I trust you and all free-thinking people will acknowledge the existence of the collective consciousness of the entire human race, a kind of living, evolving tapestry of thoughts, ideas, concepts, embodied in literature, art, architecture, cultural persuasions and so forth. This collective consciousness cannot be weighed, measured, quantified, but it is real is it not? When all is said and done, we are all of us part of this ongoing living spectacle. So if we consider all the remarkable individuals that have existed throughout history and who have contributed to our understanding, be they religious reformers, scientific innovators or whatever, even though their physical presences have transpired, the effects of their endeavours - their ideas, their concepts, are still very much alive, vibrant, affecting all of our lives in innumerable ways.
Is this not a form of life after death?