Amina Inloes, Amina Inloes is originally from the US and has a PhD in Islamic Studies from the University of Exeter on Shi'a hadith. She is the program leader for the MA Islamic Studies program at the... Answered 2 months ago

A short answer is, bid'ah is most strongly rejected when it comes to formal acts of worship. Performing mustahabb prayers differently from how the Prophet (S) taught it is a difference in formal acts of worship and is therefore inappropriate. 

Although celebrating the Prophet's birthday can be considered devotional, it is not a shariah-prescribed act of worship like performing types of salat; it is more of a customary thing. 

I am sure others will give a long answer! :)

View 1 other response to this question