Ok Guys, lets face it. If you want to look at it from a methematical/scientific point of view, I can go there.
There is a chance that God exists.
There us also a chance that God doesn't exist.
Both of these add up to one, and the die is not rolled untill we die. The values of either side are unknown. You can speculate, you can make theories, but all we know is that x+y=1, and either x or y must happen.
Now, if y is God doesn't exist, then we can die believing or not believing, with nothing happening at all if y is "chosen".
But x is God does exist. And if that one is "chosen", then our outcome changes depending on whether we are faithful or not. Would you want to miss out on the positive outcome of x just because you couldn't repent on your deathbed?
Simple maths tells us that belief is the way to go here, with two positive outcomes rather than one. And since the values x and y are unknown, no matter what you claim to know (both sides of the argument here) then you better start thinking fast.
Note: If you do meet up with God somewhere along the line, it is probably unwise to use this logic to show him why you decided to turn.
Serious note: This post seems kind of weird to me, becuase I am essentially trying to use maths to explain God, and it doesn't really work like that. Thats what you guys usually do. If I make sense to you guys this way (not trying to convert anyone here), then it has done it's job.