Is it permissible to celebrate or participate in other religion festivals like Christmas (Christian), Diwali Puja (Hindu)?
EDIT:
Does it, in any way, impose that participating in a puja (worship) of another religion means we are supporting them in their committing shirk?
I've always watched my friends take part in them and felt that this is wrong to take part in other religion festivals, but I couldn't find any evidence to tell them to stop.
https://islam.stackexchange.com/a/5814/2250 is a good answer, but I did not find my answer in it.