Canderis: Guess I'm kinda in the same boat, I have so far in my life (sort of) dealt with it in two ways.
The first one I'm not sure I recommend, it might be possible to convince yourself into believing in something after death. I made my own religion out of desperation, starting out as a generalized prayer towards a "something" who'd take care of those I had known who had died, and those that I thought was going to die soon. In the beginning, it was based on the idea that as long as I remembered them, some part of them wasn't really dead (nothing supernatural involved yet), and evolved into "me remembering them keeps them alive in the afterlife" (and voila, I became a believer). Just to be clear, I knew my religion was made up, I knew I was making it out of desperation, yet I still became a believer for a few years. Not sure if it'll work for anyone else, and it might only have worked because I was young(er), but since it's one of the few ways I have dealt with the issue, I thought I'd mention it.
Alright, this one didn't really work as well, but it's how I deal with it now. Basically I plan to arrange to have my body frozen once I get an incurable disease. Hopefully, science will eventually make us immortal, at which point they are hopefully capable of resuscitate me. Yes, I know I might die in such a way to make this impossible, that my body once dead could be ruined beyond repair, that future mankind might not want to bring me back, and that we might never be able to become immortal or able to bring me back. Still, it's a comforting thought for me at least.
@:JIGOS: I'd be willing to argue against the existence of a God (and your specific arguments, like "something had to come first"), but that would require its own thread so feel free to make one if you want.
Checking out seems not to do much.