OK..so..the Warp. Humans have 'souls' (energy/emotional force/whatever) but they have a presence in the Warp right? Some stronger than others (like psykers) but all humans exist both in Realspace and the Warp.
So.
What happens to that soul when a person dies?
Does it get released into the terror of the Warp? If so, how is that covered in the fluff on the Ministorum and faith? In mean the central tenet of Catholicism is about getting your soul into Heaven isn't it? Yet there's nothing like that in 40k as far as i can see. Nothing about 'be faithful and you will dine with the Emperor for Eternity; the faithless will be cast to the un-mercy of the Warp Gods'...
Does it just end? the warp energy/soul simply 'dying' along with the physical body? Perhaps it becomes consciousless and simply returns to its constituent Warp elements like the body decays into the physical elements?
What happens to it?
If you could support your responses with sources, that'd help me greatly (but its not neccessary - i'm just as interested in what you all think or feel about this topic too!)