It got nothing to do with PR, it's scientific. All evidence points to religion before spiritualism.
Idol worship being one of the first evidences of this.
Idol worship shows that there are
some (perhaps even most) cases of religion associated with afterlife; it does not show that
all of them are.
And you are claiming that there are
no cases of afterlife without religion and gods. That is an indefensible claim for reasons I will explain.
How do you know they're made up?
How do I know gods and the afterlife are made up?
Didn't
you just bring science to the table? Are you prepared to show scientific evidence of gods and of the afterlife?
You'd be wise to take a step back from this particular line of argument. It is, by far, the shakiest corner of your stance, and if you lean on it, it will bring your whole case down around your ears.
You are the one making a claim here. Essentially that 'there are no cases of X'. (X being afterlife without gods.)
Foghorn is simply saying that 'X is possible'. It is much more moderate stance to take.
You have the burden to prove your strong claim.
The fact that religions are generally highly-organized and highly-documented does
not mean that unorganized, undocumented practises did not exist; it simply means religion enjoys the benefits of strong PR lasting through the ages.
Don't make the mistake of assuming that religious texts are other artifacts are
the sum total and accurate cross-sectional picture of what all life and society used to be like around the globe.
That would be analogous to assuming that the only dinosaur species that ever lived are the ones we've found fossils for. In truth, the vast majority of species that lived did not produce recoverable fossils. We know there is a vast store of knowledge we don't have. Likewise, the vast majority of death practices will have gone undocumented (in no small part because such societies often didn't have writing, or long-lived document methods, or long-lived popularity).
That creates a very strong
selection bias that you are misinterpreting as compelling evidence of a verdict.
No. We don't enough to draw such a conclusion. What we
do know is that it is folly to make black and white "can't be" claims about things we
know we don't have a comprehenisve picture of. Which is what you are tring to do. Thus: an overreaching conclusion.