Buddhism is a religion based on the ending of suffering and search of enlightenment. Buddhists don't believe in a god or supreme force of any kind. They do belive in reincarnation, though. When a person reaches enlightenment, they will attain Nirvana and no longer be reincarnated.
Buddhism has what is called the four noble truths. These are "the four facts of life." The Buddha's Four Noble Truths may be described (simplicitly) as: