I don't know if "believe" is exactly the right term. I try to learn all I can about this existence, explore all perceptions of it, and use an exploration of my own conscious processes to keep adding to my knowledge. But all knowledge changes and grows. All I can do is formulate a view of reality as accurately as possible with the information I've gained.

Now as to why I believe in buddhism.... I suppose that's a complex question. When I started reading about it, it felt as though my perceptions and thoughts had been explained, and clarified, more than I would have done of my own accord. It was like telling me something I already knew, but barely understood. What I particularily like about the buddha's teachings though, is that it delivers what it promises. It lays out the techniques and practices for developing ones mind in that direction... for ending suffering, ending ignorance, and gaining control over ones karmic path. And while the Buddha's teachings are the core of my spirituality, they aren't the only ones. There's incredible knowledge and understanding to be gained from many different philosophies, and they don't all have to be religious. I've also gained invaluable information from taoism, entheogenic shamanism, quantum theory, relativity, biology, neuro-chemistry, yoga, meditation, and my own life-experimentation with perceptions and actions and their observable results.