Buddhism
The founding of Buddhism is a story of its own. There was once a Prince Gautama of India. He had everything: wealth, food, a luxurious home, a beautiful wife, finely-woven clothes, servants, comfort--everything, really. But one day, he went on a trip to the outside world, and encountered a poor man, an ill man, and a dead man. After that, Prince Gautama was never really the same. He refused to go back to his little bubble of paradise. How could there be so much suffering in the world, while a select few had every whim granted? Instead, the prince sacrificed his title, home, all possessions, and his entire lifestyle to become a monk. He fasted, meditated, and finally discovered the thing he had been searching for after 6 years: the meaning of life. And, he became the Buddha, meaning the "awakened" or "enlightened" one. His discovery was based on the idea that life is filled with suffering, and the suffering is caused by desire. If you could eliminate yourself of that desire, then you would reach the state called Nirvana, in which there is no desire, and therefore, no suffering and happiness. Failure to reach Nirvana results in reincarnation. The body you're reborn in depends on your karma in the previous life. If you were a good person, but just not quite good enough for Nirvana, then you'll have a life with less suffering the next time around. Poor behavior results in being reborn into a step back from Nirvana. If you've reached Nirvana, the cycle of reincarnation is broken, and the soul will finally go to heaven. And all you really have to remember is this: to not want is to not suffer.