IDK. All these questions seemed really important when I first discovered them... but the questions of god, the afterlife, and the meaning of life on Earth really don't have any concrete answers, so I think it's best to just concetrate on living life- while it's there.
It's like the guys in a firing squad- one of them has a blank bullet in his gun- but they never find out who, so they can never be absolutely sure that they were the one who killed the condemned man. Likewise, there might be a god who is a really nice guy with a beard who says 'Welcome to Heaven'... but the odds of that are pretty remote.