QUESTION: Is it permissible to wish Hindu neighbors well for their Diwali?
ANSWER: Just like it is not permissible to wish Christians well for Christmas, so too is it impermissible to wish Hindus well for Diwali.
The Kuffaar festive and religious festivals are pure KUFR and SHIRK.
Hazrat Umar (Radhiyallahu anhu) used to say that one should stay far away from the Kuffaar during their festivities and religious occasions. This means (in our context), one shouldn’t wish them well, by saying things like, “Happy …..”, “Merry ……”, etc.
Wishing Kuffaar well over their Kufr festivities puts our Imaan at great danger.
Rather, during their Kufr festivities, increase in Istighfaar, and excessive recitation of Laailaaha illallaah….
May Allah Ta’ala protect our Imaan at all times, Aameen.