Case Study 7: Religion, Human Rights Law, and 'Opting Out' of Religious Education. There are six main denominational strands ranging from Liberal through. World Religions for Children doing their homework. The Largest main World Religions in order are: Christianity: 2.1 billion Islam: 1.3. Beliefnet is a lifestyle site that serves as your number one resource for faith, belief and spirituality. Visit our site daily for inspirational quotes, prayers for strength…