You cannot be right just because he is wrong, unless your claim is only that there is some sort of afterlife and that you do not believe in any particular version. Would you be right if the afterlife was that of any other religion other than your own, or one that no particular religion has thought of yet?
This is one of the may similar questions in which too many members are unwilling (or afraid), even as a hypothetical, to entertain the thought process of imagining an afterlife; even those who are 100% of its non-existence.
So much squirming, so much fighting the hypothetical, so much trying to escape its simple and straightforward meaning and intent.
Just say yes or no (or potato) and don’t look for excuses.
Does knowing one way or the other change your perspective on life after you pull the ripcord (or not, as the case may be)?
I am amused by anyone who claims to 100% know something that is so clearly unknowable.
mmm
ETA:
Now that’s more like it. 
I also concluded the odd answers and bad logic must be due to some sensitivity about the question, always ready to fight the Christianity/anti-Christianity war more than think about points raised by people perceived to be on the opposite side of that fence.
Shodan’s formulation for example is self evidently correct at least this far: a believer in an* afterlife can only be proven right, by finding themselves existing in an afterlife. One who positively believes in no afterlife can’t ever be proven right, and could be proven wrong by ending up in one.
The valid nitpicks at the (first and second) statements are:
- the first tied together an afterlife and God, even besides the responders assuming by the self-reference that it meant Christianity. But there could be an afterlife without God(s), or where people still don’t find out if there is. This life exists and we don’t know if there’s a God: why couldn’t there be another one where we still don’t know?
- again assuming any possible system, it could be that having an afterlife depends on believing in one. If so, people who don’t believe in one will never be proven right or wrong.
It could also be that believers in an afterlife won’t know they were right even if there is an afterlife (some forms of belief in reincarnation are like that). But if they ever know the answer it could only be that they were right. All if we accept the basic concept that existence is a necessarily condition for knowing anything.
- an afterlife, not the particular description of one in a particular belief tradition.
Which afterlife are we discussing?
I see this is a rare poll where there’s near-universal consensus among Dopers. As of this posting, no one has answered “yes” to the offer, although a few people have chosen potato salad.
I’m curious what about this deal the OP thought was going to be tempting, because it seems so obviously a bad bargain that I have difficulty believing any rational person would agree to it. I guess I could maybe see taking the deal if you were already destitute, but even if literally all you owned were the clothes on your back then you’d immediately be much worse off if those suddenly disappeared.
I care why? There’s an afterlife, or there isn’t. My morality is my own responsibility and I’m not going to change anything based on a potential outcome if there is a flexible and just afterlife. If there’s a crummy capricious afterlife, I’m unlikely to be able to change my fate. Fortunately, though, I know very deeply that dead is dead and there is no afterlife.
This is obviously a trick question, and the magical being is Satan. If you make the deal it means you don’t accept on faith what the Bible says about eternal life and salvation and all that stuff. Therefore, the answer is “you’re doomed for eternity.” At least for YOU, that is.
I know what happens to brains, and I know that’s where the person known as me comes from. The fact that people don’t want to die leads them to invent scenarios where they think there is doubt, but I see no more reason to have doubt about this than I have about what happens to a toenail once I clip it.
God gave me patience the moment I demanded it; I’ll wait. 
And when you get to hell, you’ll scream “But why, God??” and he’ll answer “I sent you that magical creature to help you out but you decided you would rather keep your X-Box”.
Nothing about a detailed answer in the OP. That’s an entirely different scenario. The being is only telling you what happens.
If they come and they tell me that there is an afterlife, and that if I give up all my stuff, they will give me the proper directions to get there, that’s a whole different ball game. Of course, this involves me believing them in the first place.
The fact that this creature is “magic” does not mean that it is supernatural. Magic is technology that we do not understand, supernatural is stuff that doesn’t follow the laws of physics. I can see how an advanced race that has effectively conquered death could also have a glimpse as to what, if anything, lays beyond, without the need to invoke any sort of divine presence. For instance, if everyone who has had a “near death” experience, where they could be well beyond the point where we would be burying them and drinking in their memory and still be brought to health, independently reports the same experiences, or if they are able to communicate with those who have died in the past and bring back verifiable information, then that would be evidence for something.
The answer the being could give is that we are in a simulation, and that we will wake up in our game pod, and the arcade machine will be flashing “Continue? $0.25”. Personally, while I don’t subscribe to the simulation hypothesis, I find that to be far more likely than a supernatural afterlife.
Question to Shodan and his wager against the atheist, if we die and wake up in a game room, does that count as a point for you, or a point for the atheist?
I’m pretty sure once the magical creature saw how little all my stuff is worth, he’d probably walk back the offer to a handful of magic beans.
You say that like its a bad thing. 
Material things are nothing in comparison to knowledge of truth. I would wholeheartedly ask for the secret of death.
It’s a little weird for me that there remains any serious doubt about what happens after death. You just have to take a George Carlin style approach. If something happens to me after I die, does it happen to all humans? How about children? How about for people who have different religions? How about criminals? How about people who have abnormal brains (mental illness, dementia, non-linear thought processes)? How about other mammals? In what meaningful way are humans different, in terms of death, then a dog? Wouldn’t it be terribly cruel to condemn an animal that has been nothing but obedient, loving, and loyal to a “less than” after death experience?
How about insects?
How about plants?
How about viruses?
How about rocks? Do rocks die? They certainly change.
How about elemental hydrogen? Does elemental hydrogen go to heaven?
In short, the only reason we imagine that we have any sort of experience after death is because we invented the idea.
So, I guess, if a Magical Being asked if I’d like to know what happens after death, I would answer that question with a question of my own, namely, “Why would I think that there is something that happens after death?”
I have a world view that excludes magic (and afterlives). So, if I had a way to know that this magical being was for real, it already upsets all the apple carts. If there’s magic, whatever he says could be reversed, et cetera. The premise of this hypothetical renders us unable to do any real reasoning, no matter what he would have told us. How do you fit magic into any sort of reasoning framework? It’s like playing a game with a small child who keeps whimsically adding new rules.
No, it’s more like we’re born into the skydive. We’re all gonna die when we hit the ground. Whatever the arguments are that there might or might not be some continuation of our identity and consciousness after we die - and as a born-again Christian, my belief is that it’s so - I’m not sure how or why that should affect what we do during this life.
You don’t need the presence of God in your life to know that we should do the best to love and have compassion for each other while we’re here. And if there should be no afterlife, then this time we spend here is even more precious than if there is one, because then it’s ALL there is, rather than being a brief prelude to eternity. And in that case the need to have compassion for one another on this journey is that much the greater.
Each answer is atheister than the last! Who wil be this thread’s Top Atheist?!!