Basicly, this might get to religious... however lets stick to the first factor you need for an afterlife: A soul-like substance.

I think souls are totaly bullcrap. No soul can ever be found, it's a myth without boundaries. Like alot of 'human' terms. For one: What does have a soul and what doesn't? People 'have souls'. Do mammels? Do reptiles? Do insects? If no, why not? --> that takes us back to creationalism.

Endless discussion. An afterlife seems unlikely. There is no proof but jibbering about invisible enteties going to other places with no arguements at all.

I could now say: Brains are actually just a representation of a different universe. Every individual is 'controlled' by a midget that rules his own universe that correspondates to the human brain. Total bullcrap, yet as hard to disprove as afterlifes.