"There is more in the Heavens and the Earth, Horatio
Then is dreamt of in your philosophy" - Hamlet. W. Shakespeare.
The current afterlife hypothesis' that are most frequently subscribed to are often concurrently, and blindly, adopted - or are plainly indoctrinated into the mind from youth. All these schemes, however sincere, are guilty of using faith as a prop-up mechanism and immortality as a mass appeal 'get out of death - alive! card', mass appealls to faith and offering people what they think they want; is religion. Afterlives appear, and have appeared since we dawned as a species, as beliefs of devout conviction, in almost all minds. This is a sort of basic human theological truism of life (this trusim being an exception to the definition of the word as afterlives are fictitious). Afterlives, the entire, almost endless catalogue of them, are a result, once again, of the idiom of: too much faith leading to religion - too much faith is the leading cause of beliefs that consider afterlives as facts - not as mere quixotic escapes from temporal "mortal coils" or unimaginitive philosophies (Ohh Horatio...).
Afterlives exist only as human constructs after all, and as Hamlet says, philosophies are much more impoverished and banal than the cosmos' philosophy. I do not mean to say here that the cosmos has a mind or an ideology or position on death. I mean to say that the cosmos itself, it's existence, it's laws and bizarre objects are more grand by far, than any philosophy we have ever concocted - the cosmos compared to theology makes theology and it's afterlife hook appear as a bankrupt dream, that the impoverished mortal mind one day hopes, but will always fail, to cash in upon death.
"Man is poised halfway between the Gods and Beasts"