I'd say it was Indianization. Christianity MUST NOT be thought of as being a purely Westerner religion.
Also, things likethe Christmas tree and hte Easter Egg aren't strictly Christian but local customs that were used to spread the teachings of Christ. I agree it is a dicey situation and it's mostly dancing on the line, but Christianity in India MUST adopt some of the local culture, NOT the religious aspects.
So, the major festival for Indians is Diwali and it's celebrated by Muslims and Christians too. An Indian festival, NOT a hindu one, more like a harvest festival.
I’ve never seen a Christmas tree in a Christmas cantata or Easter eggs in a Passion play. As far as Diwali this is what I’ve found
http://www.sscnet.ucla.edu/southasia/Culture/Festivals/Diwali.html
“As with other Indian festivals, Diwali signifies many different things to people across the country. In north India, Diwali celebrates Rama's homecoming, that is his return to Ayodhya after the defeat of Ravana and his coronation as king; in Gujarat, the festival honors Lakshmi, the goddess of wealth; and in Bengal, it is associated with the goddess Kali.
Sorry. I don’t think the God of the universe looks kindly on sharing His services with false gods. This is a little more than an Easter egg.