Many theists go to great lengths to try to prove that a god exists. Why? Well, because if he does, then you should definitely start worrying what happens to you after death.
Wait, what? Why is the assumption made that if a god exists, there's life after death for us? Where is that coming from? How does that follow?
Even if there were a god, the proposition that there's life after death is a completely different and independent one. It definitely does not automatically follow.