I'm of the mind that Faith is highly important in one's life, but I won't try to argue anything with you right now. it seems you are in the middle of brooding and I know I can be aggressive.
as for the Cycle of Life and Death, and the question of how natural it is to let go... lemme see if I can't give my view clearly...
I think that we are naturally inclined to hold onto what we have or seek out what we want, much more so than to let it be free. this goes for everything from slavery to ambition to greed and pursuit of wealth, to even simple jealousy and/or abusive relationships; people want what they want and are loath to lose it.
however, loss is also natural, and a natural coping mechanism is for us to be able to move on in life. in short, all of the natural behaviors are what are good for our survival and gratification. we naturally don't want to give up what we have or are trying to achieve or attain, however if we know that we cannot have it or that it will cost us something else more valuable or important to us than we are naturally capable of letting go to preserve something else.
also, naturally we become emotionally hurt, because the conflict thus makes it impossible for us to have what we want one way or another. we suffer, and that is natural. that is why we are capable of moving on -- because if we didn't, we'd go mad. it is in our survival-interest that we can let go, even if we retain strong feelings for something.
Death is part of Life. in fact, Life is a process of combining two pieces (two individual cells each comprised of 23 chromosomes) which once combined can then begin to multiply and grow. these pieces grow and grow and continue to grow until they reach a peek point (think roughly 40 years old, the "over the hill" point in life). then, they begin to deteriorate.
that is why we have the urge to procreate, we litterally make copies of ourslves in micro, which combine with copies of someone else and become a hybrid of wo individuals. that person then grows up to pass on the mixed genes that they have before they deteriorate, and so on.
it isn't just a Cycle of Life and Death -- it's a Cycle of Life, Sex and Death.
but, if you would be willing to hear out this belief of mine, death isn't the end. one of my favourite quotes is "I don't have a Soul. I
am a Soul. I have a Body."
see, the physical Body is the vessel for our consciousness and our animating Spirit. our Soul and Spirit live on, our essence goes on to inhabit another Body and go through it's life. we experience things in the physical AND in the mental. after all, our Minds are who we realy are.