Anyway, a lot has been said, and we're bound to have a bit of repetition. But here's my say on my beliefs, or lack thereof, refined thank to this forum.
I'll make a comparison : I can't scientifically prove that there is no gosh in my room.
The reason is simple : there is no unified gosh theory.
Anyway I don't feel the need to prove it: I've never saw such gosh in action, and the very idea of a gosh haunting my room is all kind of silly.
It, however doesn't mean that I rebuke all idea of life after death.
However, If you add detail such as "the scary gosh of a little girl that will murder you if you don't send this email to ten poeple in the next hour", I'll pretty much laugh in your face, and add your email address to my spam list.
Do I believe in gosh?
It's a complicated problem if your think about it : I don't completely rebuke the idea of life after death, but still won't respond to you chain email.
My stance on the problem is that I don't believe in gosh, because gosh are something of the folklore, and that the hypothetic lasting trace of a deceased human deserve a more fitting name. But it's a purely semantic argument.
It's the same problem with the belief in god.
I won't agree that a traditional belief in god (catholic, Lutheran, Sunni Islam,...) is even remotely reasonable.
However, depending on how much your definition of god is watered down, it may come back to a reasonable level of sense, both scientifically and philosophically.