I wish I had seen this thread earlier. Hopefully my two cents are worthwhile, as I have spent lots of time thinking about these questions and discussing them with people I consider to be very open-minded and intelligent.
Going back to the original question, if you look at the word religion then you can see where the need for a good arises. Etymologically, religion means to re-bind. We seek in religion to reconnect with deeper things, with sacred experiences, with a meaning of life beyond simply surviving. It depends on the religion, but usually religion seeks to reconnect us with others, with nature, and with our own true self beyond our superficial ego that is formed by other people's and society's expectations. Given that the meaning is rebinding, there is an inherent suggestion that we are broken, which I believe is pretty easy to see. Huge numbers of people seek meaning through power, image, money, and other material things. In my experience, people who seem to be happy by achieving those things are actually pretty empty and miserable.
In the Christian tradition, we cannot rebind to deeper meaning without the help of a higher power (Christ). We admit and realize our dependence on him to help us become whole again. Ultimately we are aiming to let go of our worldly desires and live for a higher purpose. This is where all the examples of Christ encouraging others to leave all their possessions and follow him come from. In the Eastern tradition, especially Buddhism, the rebinding comes from the self, no other power is necessary. One seeks to withdraw and disconnect from one's worldly self solely through your own power.
So far this is all stuff that factual and historical, not my personal beliefs. I have been raised as a Catholic but struggle with many questions, some similar to those other people have posed. Seeing genocide, disease, murder, and the unbelievable apathy of humanity leads me to question how a supposedly all-powerful yet all-loving God can allow such horror. The only conclusion that I can satisfy myself with is that contrary to just about every Church's teaching, God does not intervene in the Earth. Our prayers for a sick person to get well or war to stop are basicallly pointless. I cannot picture a God who would answer one prayer and miraculously cure someone's cancer while allowing millions to starve. It paints a bleak picture for some to think of God as distant and unanswering, but he does give us tools to do something about all the injustice of the world: Us. A quote that I personally like goes something like: "Sometimes I want to ask God why he doesn't do somthing about all the hatred and injustice in the world, but I'm afraid he'll ask me the same question." We are the only hands Jesus has in the world, and we are his tools to act out his message of love and justice.
And as to people who say they cannot believe in God because it doesn't make sense or something like that, I offer this quote by Paul Tillich: "Faith is not a theoretical confirmation of something uncertain, it is an existential acceptance of something transcending ordinary experience." I realize this goes beyond the average 14 year old NSer's understanding, so let me try and put it in simpler terms. When you have faith, you are not simply saying, "Ya, I think there's a God out there. Ya, I think there is." You are accepting that God goes beyond our understanding and comprehension. Hopefully at least one person can find some meaning in that, as I know I did.
I could go on, but I think that is probably enough for one post. I still have many questions about God and religion, but I have learned to accept those and use the struggle for answers as growth. If anyone wants to discuss anything about religion, I would love to.