an atheist dies and goes to hell. he's very surprised that there is an afterlife and anxious of what will await him he steps in front of the devil.
devil: 'hello mortal, i'm sure you know why you're here so let's not waste any time. let me show you around this place.'
the devil shows him hell: a world that looks like a mixture of compasspoint studios and playboy mansion, endless beaches, endless barbecues, free drinks everywhere...
the atheist is very pleased and adjusts to the situation quickly, getting a straw hat, a hawaii shirt and a drink.
after a few days of wandering around, participating in various parties etc. he walks upon a huge wall. at first he doesn't think too much of it but after a while he starts to really wonder what it is and why it is there. he goes back to the devil and asks him.
devil: 'oh, i didn't have time to show you that part but most people find out about it sooner or later anyway. let's have a look!'
they take a huge ladder, climb to the top of the wall and look on the other side.
there, one can see a world of fire, everything is covered in lava, there's mortals being burnt and tortured constantly by demons, crying out lout in pain, all in all a really horrible sight.
atheist: 'but i don't understand, why didn't i get there? after all i wasn't religious, not even moslem or buddhist or anything but even worse, i was an atheist all my life!'
devil: 'well, this is not for everybody! we provide this service exclusively for christians. they want it that way.'