It is not permissible for the Muslim to join the kuffaar in their festivals and to express joy

It is not permissible for the Muslim to join the kuffaar in their festivals and to express joy and happiness on these occasions...

Abu Dawood (1134) narrated that Anas (may Allaah be pleased with him) said: When the Messenger of Allaah (peace and blessings of Allaah be upon him) came to Madeenah, they had two days when they would play. He said: “What are these two days?” They said: “We used to play on these days during the Jaahiliyyah.” The Messenger of Allaah (peace and blessings of Allaah be upon him) said: “Allaah has given you instead of them two days that are better than them: the day of al-Adha and the day of al-Fitr.” This hadeeth was classed as saheeh by al-Albaani in Saheeh Abi Dawood.

Praise be to Allaah. 
It is not permissible for the Muslim to join the kuffaar in their festivals and to express joy and happiness on these occasions, or to take the day off work, whether the occasion is religious or secular, because this is a kind of imitating the enemies of Allaah, which is forbidden, and a kind of co-operating with them in falsehood. It was proven that the Messenger of Allaah (peace and blessings of Allaah be upon him) said: “Whoever imitates a people is one of them.” And Allaah says (interpretation of the meaning): 

“Help you one another in Al‑Birr and At‑Taqwa (virtue, righteousness and piety); but do not help one another in sin and transgression. And fear Allaah. Verily, Allaah is Severe in punishment”
[al-Maa'idah 5:2] 

We advise you to refer to the book Iqtidaa’ al-Siraat al-Mustaqeem by Shaykh al-Islam Ibn Taymiyah (may Allaah have mercy on him), for it is very useful on this topic. [Translator’s note: This book is available in English under the title “The Right Way,” published by Darussalam, Riyadh]. 

And Allaah is the source of strength. May Allaah bless our Prophet Muhammad and his family and companions, and grant them peace.