Looking at the Christian model, the meaning of life is almost like a test, to determine your place in the eternal afterlife (that is, heaven or hell). However, a question arises from this proposition. What, then, is the meaning of heaven and hell? Or God, for that matter? I imagine that if there is an afterlife, we will be doomed to continue to question the meaning of it. If eternal life in heaven is the reason for our living in this world, what is the reason for our living in heaven?
This is a massively important question. Is heaven as big as it gets? I mean, that explains this life, but it leaves even larger questions as to the purpose of the afterlife.
Let's say that the reason for heaven and hell is God. But then what is the reason for God? What came before God?
Where does the chain of causation start? Where does it end? Where do we go? (ignore the OLP reference, it came out by accident

If a reason for heaven can not be established, how can one believe that the reason for this life is heaven? How can one believe there is a reason for life at all?