You make a good point! I meant diversity in terms of numbers. With regards to diversity in terms of how great the difference are, I agree that Hinduism has us beat there.
It is my impression that the Hindus think of Christians as religious amateurs. They embrace diversity of thought as an essential part of Hinduism to where they can even embrace all of the ideas and teachings of Christianity as part of Hinduism (that was pretty much the idea behind the Hari Krishna movement).