While the handful of major world religions are familiar ... it's easily the world's largest religion, with around 2.3 billion adherents. Just one example of Christianity's enormous influence ...

Tibet and Sri Lanka celebrate those holy days on different dates. In addition to its five main religions, India recognizes days for Jainism and Zoroastrianism.

However, for many people religion can be a power for peace. A message of peace and love towards others is at the heart of all of the major world religions. This is called The Golden Rule.