Dude, drop the pretentious angry atheist shtick. It's old and tired. Grieving and it's process aren't "a load of unsubstantiated psycho babble" at all. Far from it. Any evidence you need is all around you. It is NOT about religion. Death is a universal constant. When we as humans experience loss of someone or something we have developed emotional attachment too, there is a natural response to that. If you cut your finger, your body responds to limit disease and initiate healing. The exact same process happens with mental wounds. We as societies have always given this process an opportunity to work, most fundamentally in the gathering of others around the bereaved and often with some type of reflection or recollection of what the dead meant to the living. Later we coupled this with a way of disposing of the corpse in a way that was safe and limited disease (burial, burning, or whatever) based on cultural mores. As religion developed, it was inevitable that it too would get wrapped up in such a fundamental human experience as dealing with death and mortality is.