Judaism is to Christianity as Hinduism is to Buddhism. To my SAT-satiated high school seniors, this is the way I explain the origins of these four central religions. Though it is a simplistic analogy and perhaps a disservice to the complexity of the religions, it works. But while it is easy to see the connections between Judaism and Christianity as they are reflected in the Bible, it is not always easy to understand how Buddhism arose out of Hinduism, particularly because the textual basis is more obscure.
Siddhartha Still Works