This is a great question. Unity in Diversity in religion is just one facet of our great nation, but a significant factor.
The previous rented house where I lived in had a mosque, a church for Mother Mary and a temple all in the same neighborhood in Bangalore. In the morning, you could devotional songs from all three places of worship but you never had any fights. Not even one. Everyone respected the other religion and its boundaries.
This is a classic example of unity and diversity that I have seen.