SPOILER ALERT: Nothing happens after you die, except you become worm food. It's irrelevant. What's really important is what you do with your life before that happens.
I have seen no evidence or argument that's pro-afterlife that makes any sense, aside from it being an imaginary idea that people have concocted up because they're too scared of death to face reality. Not only is there no scientific proof of there being an afterlife of any kind, the very idea is ludicrous on its face. It's like a child asking you check for monsters under the bed or in the closet, and then demanding proof that said monsters do not exist, and claiming victory when you can't prove that said monsters do not exist.
Why should there be an afterlife of any kind, good or bad? What purpose would this serve? Do whales, dolphins, apes, elephants, cats and dogs also go to heaven? Why not? What about intelligent invertibrates like octopuses and cuttlefish? What about hell? And if so, is this restricted only to intelligent animals? What about rats and cockroaches? What about bacteria and viruses? Why are they unimportant? Who decides which lifeforms have a soul? What IS a soul? Can it even be defined? Is intelligence or sentient intelligence the defining factor here?
What if you're brain-dead? No brain activity whatsoever, no hope of recovery; but your body is still technically alive and breathing. Where's your soul then? What if you're mentally retarded and have the IQ of a goldfish? What if you're a child? What if you were aborted? Stillborn?
And what would you do in the afterlife? Exactly how would it not be terminally, mind-numbingly boring? What is the afterlife for? What function would it serve? What's the point?
Let's not even get into the whole idea of hell. I find it hilarious that so many people think there's life after death in some form, but reject the idea of hell. At least that's been my experience: "yeah, there must be something after this life, but I don't think hell is real." Well, why not? You believe in heaven, why not hell? You want the good, but not the bad?
What if you're a mass murderer? Is Jeffrey Dahmer chilling out in heaven with all the young boys he raped, tortured, murdered and ate? Technically he should be, because he apparently genuinely repented and accepted Christ as his savior just days before he was shanked in prison. The afterlife must be mighty awkward for him, I imagine.
Not to mention that the only real function of heaven and hell appears to be the carrot and the stick. "Be good and you'll go to heaven, but be bad and you'll burn in hell for eternity." It's like Christmas and Santa Claus making his list and checking it twice. You know, if you're a good little boy or girl you get gifts. Be bad and you get a lump of coal.
Except you grow out of that phase. With religion what you get is people being actively encouraged to ruin their lives because after all, this life is just a blink of an eye in the face of this supposed eternal bliss. God will reward you for all the fun you didn't have by not throwing you into hell.
Makes you wonder why one would WANT to spend eternity with a guy like that. Even my parents would never psychologically manipulate me like that, even if it really was for my own good. So if there was a heaven, would I really WANT to go there? Sounds odd that God would create me in his own image and whatnot, give me free will, and then punish me for using that free will. So it's a choice to follow or reject God, yes, in the same way that a rape victim with a gun to her forehead has a choice to disobey the rapist. Argue all you want whether rape or a bullet to the head (or both) is better, but don't try to tell me that victim is "free to choose."
Anyway, life is precious specifically because it's finite and the only one we have. I don't have a problem with this, because I'd rather live a full but short life than a long but empty, boring one, wouldn't you? The clock is ticking. Do something. Live. You're going to die anyway, what do you have to lose?