I read something about grieving today in the American Atheists magazine. It was something that Penn Jillette said. Penn is not exactly my favorite person in the atheist movement (far from it, actually), but I really liked what he said about grieving.
His observation was to this effect: if there is a god, then when your loved one dies you’ll wonder if you could have done more, prayed more to prevent their passing or reduce their suffering. I would add that if there is a god, s/he’s quite cruel for the way s/he takes certain people out of this world, and who wants to believe in a supernatural being that behaves like that?
amandatheatheist 
There are a lot of answers to the question of “Why is someone taken from us?” none of which are very satisfying. It is hard to come to terms with the loss of a loved one, I do not think we ever really lose that feeling of loss. If, and that is a big if, there is something out there determining when someone dies, it is not a being I wish to know or acknowledge because they would have to be without emotion or humanity, merely moving us around like photos on the dining room wall.