How does anyone know if it beats the alternative? You could be partying and hanging out with Philo, Josephus, Plato, Aristotle and Jesus in the afterlife!?! You could be a little baby again and drink from your mother. Or you could be a worm.
We don't have any way of knowing that we'll get to experience any of those things. If there is an afterlife, nobody there has found a credible way of letting us know it, and promises of an afterlife are worthless.