there actually is no afterlife for us. every human soul/mind/consciousness is completely destroyed when the body ceases functioning. but! a little-known fact is that this is because our hearts are literally always more heavy than feathers.

in order to reach heaven we must call upon science to reengineer the most large-feathered of the dinosaurs (perhaps beginning with the rare Ma'atosaurus) in hopes of bringing into existence a feather capable of setting an achievable bar for humanity

that said, once our goal is attained, we must be prepared to enter an afterlife that is predominantly populated by those non-human organisms with hearts less massive than currently-existing feathers. And suited more to their eternal bliss than ours.