Buddhism was started around 400 BC in India. They don't believe in a supreme being or God. They didn't write in a holy book or any type of book, they wrote in scriptures in many Asian languages. Buddhism isn't really referred to as a religion, it's referred to a psychology due to the fact that they focus on meditation and mindfulness. The first written fact about Buddhism was written in 2 AD. The Buddha got a group of monks and nuns known as the Sangha who have preserved the religion down through generations.