One problem I've had with the claim that there is no life after death is that it involves making a bet that even a die-hard atheist shouldn't be confident making.
See, the focus is normally on particular kinds of life after death - "you die and then you're in heaven/some place". Now, I think there's actually some very suggestive evidence there, empirical and philosophical and otherwise.
Now what about actual physical resurrection? That's key in the Christian tradition of course, and apparently so in the jewish and muslim ones as well. Oddly enough - without getting into questions of deeper metaphysics - superficially it seems even a materialist would have to entertain the logical possibility of life after death if it's put in the form of a resurrection. Put the right matter back the right way and, there you go - death undone.
But here's where the problem comes in. Eternity... that's a very long time, and even the atheist is going to believe in eternity by and large. And if at death you either don't have consciousness, or don't have the right sort of consciousness, any resurrection of your body at any point is going to make any amount of time pass in a blink for you. Couple that with matter/energy being unable to be truly destroyed as opposed to changed - according to scientific theory - and it seems to me you have reason to be pretty spooked about the possibility of life after death, even if you're an atheist.
Granted, this leaves all kinds of specifics up in the air, and it's certainly not a proof of *heaven* or the like. My greater point here is that a lot of things can happen given eternity, and there is no quicker way to wait through eternity than to die or sleep through it.