The purpose of the life after death is completion. And a fullness. A becoming one with God. A revelation of truth, of love, of knowledge, of understanding.
I also agree with Fil. Albuquerque when he asks, what is the purpose of life before death?
Life and life after death(should it exist) have the same purpose, knowledge of God. Bringing our spirit into oneness with the spirit of God. To love God. We can spend our lives and all eternity exploring God and the ways of God and still not reach that. But the journey is not wasted. Now we see things imperfectly, like puzzling reflections in a mirror, but then we will see everything with perfect clarity. All that I know now is partial and incomplete, but then I will know everything completely, just as God now knows me completely.
If this is the purpose, why even bother with the whole living part then? I mean if the purpose of living is to discover god and the whole point of death is to become one with god, it does not follow that there need be a life step. It is absolutely absurd reasoning to say that there needs to be a life step. Why not just create the being already absorbed into god? Wouldn't it be far more efficient? Think about it.
If you must under go a life that has a very vague understanding of what god is, and there is even a chance you would out right reject the god notion. Then wouldn't god creating this system be making it indirect?
To put it in another way to help you understand what I mean by this. Imagine there is a business which you have never seen. You have never met any of it's workers, you don't even know if there are any workers. You don't even know where this business is located. This business has a product to sell but instead of advertising it directly it just waits for people to buy it. The business relies completely on the fact that the product and not on advertising. Do you think this is an efficient business model for such a product?
(please don't try to bend my analogy by claiming the workers could use word of mouth to spread the knowledge of the product thus creating a snow ball effect of sales. As much as I know this is a way, I am referring to all methods of advertising were avoided including word of mouth advertising.)
You might try to claim that the god the manufacturer has done advertising, but I object to that claim. Because every theist out there has a different take on what the product is. So in reality the product was never advertise but instead the product has been promoted by the consumers themselves. It is the consumers who are falsely advertising the product to sell to others. The reason they do this? To cash in on the product that which does not exist.
So this god indirectly creates a bottle neck in the system if you claim that the whole point of life is to discover god. Because the chances of success are very very low. There are thousands of religions that do not support the christian definition of god. So your chances of choosing the correct religion is very small. However theists never make this assessment, they just assume their belief is correct and care nothing for the possibility that they could be just as wrong as the next person.
So I reject the claim that the purpose of life is to discover god. If I am wrong so be it but I will still stand on the point that god has used one of the worst possible scenarios to achieve the purpose of life.