Question: How many types of Bid‘ah (innovation in religion) are there? Is every Bid‘ah misguidance? If yes, are the diacritical marks used in the writing of the Qur’aan, such as Dammah (a small curl-like diacritic standing for the short vowel /u/), Fathah (a small diagonal line placed above a letter to stand for the short vowel /a/), Kasrah (a small diagonal line placed below a letter to stand for the short vowel /i/), Sukoon (a circle-shaped diacritic placed above a letter with no vowel), Nuqtah (dots and diereses placed above and below Arabic letters to distinguish between them) or Nabrah (a carrier on which the letter Hamzah is placed in cases of Kasr) an act of Bid‘ah, as the Qur’aan was written during the lifetime of the Messenger of Allaah (peace and blessings of Allaah be upon him) without any diacritical marks? Is the writing of these marks an act of Bid‘ah? Is this Bid‘ah a deviation from what is right?
Answer: Bid‘ah (i.e. An invented or newly introduced thing) is divided into Bid‘ah in religion and ordinary Bid‘ah. The ordinary Bid‘ah includes all newly manufactured products and inventions… read more here.